*as per moz updated 4/13/2017
“Fred” (Unconfirmed) — March 8, 2017
Google rolled out what appeared to be a major update, with reports of widespread impacts across the SEO community. Gary Illyes jokingly referred to is as “Fred”, and the name stuck, but he later made it clear that this was not an official confirmation.
New, unconfirmed Google ranking update ‘Fred’ shakes the SEO world (SEL)
Did Google’s Fred update hit low-value content sites that focus on revenue, not users? (SEL)
Unnamed Major Update — February 6, 2017
Algorithm changes beginning on February 1st continued for a full week, peaking around February 6th (some reported the 7th). Webmaster chatter and industry case studies suggest these were separate events.
The February 7, 2017 Google Algorithm Update – Analysis and Findings From A Significant Core Ranking Update(GSQi)
February 7th Google Algorithm Update Was Big (SER)
Unnamed Major Update — February 1, 2017
There was a period of heavy algorithm flux starting around February 1st and peaking around February 6th. It is unclear whether this was multiple algorithm updates or a single update with an extended roll-out, but anecdotal evidence suggests at least two updates.
Unconfirmed Google algorithm update may be better at discounting links and spam (SEL)
Intrusive Interstitial Penalty — January 10, 2017
Google started rolling out a penalty to punish aggressive interstitials and pop-ups that might damage the mobile user experience. Google also provided a rare warning of this update five months in advance. MozCast showed high temperatures from January 10-11, but many SEOs reported minimal impact on sites that should have been affected.
Google warns it will crack down on “intrusive interstitials” in January (SEL)
Official: Google Intrusive Interstitials Mobile Penalty Now Rolling Out (SER)
Unnamed Major Update — December 14, 2016
Multiple Google trackers showed massive flux around December 14-15, including a rare MozCast temperature of 109°F. Webmaster chatter was heavy as well, but Google did not confirm an update.
December 15th Google Search Algorithm Update Signals (SER)
Unnamed Major Update — November 10, 2016
MozCast detected a major (106°) spike on November 10th and another on the 18th. Industry chatter was high during both periods, with some suggesting that the second spike was a reversal of the first update. Google has not confirmed either event. Many people reported bad dates in SERPs during the same time period, but it’s unclear whether this was causal or just a coincidence.
November 10, 2016 Google Algorithm Update – Was It A Core Ranking Update, The Mobile-first Index Being Tested, or Both? (GSQi)
Was There A Google Search Update On November 10th? (SER)
Penguin 4.0, Phase 2 — October 6, 2016
The second phase of Penguin 4.0 was the reversal of all previous Penguin penalties. This seemed to happen after the new code rolled out, and may have taken as long as two weeks. Post-Penguin activity had one final peak on October 6th (116°), but it is unclear whether this was Penguin or a new update. Algorithm temperatures finally started to drop after October 6th.
Penguin 4.0, Phase 1 — September 27, 2016
The first phase of Penguin 4.0, which probably launched around September 22-23, was the rollout of the new, “gentler” Penguin algorithm, which devalues bad links instead of penalizing sites. The exact timeline is unconfirmed, but we believe this rollout took at least a few days to fully update, and may have corresponded to an algorithm temperature spike (113°) on September 27th.
Why Didn’t You Recover from Penguin? (Moz)
Penguin 4.0 Announcement — September 23, 2016
After almost two years of waiting, Google finally announced a major Penguin update. They suggested the new Penguin is now real-time and baked into the “core” algorithm. Initial impact assessments were small, but it was later revealed that the Penguin 4.0 rollout was unusually long and multi-phase (see September 27th and October 6th).
Penguin is now part of our core algorithm (Google)
Google updates Penguin, says it now runs in real time within the core search algorithm (SEL)
Image/Universal Drop — September 13, 2016
MozCast recorded a nearly-record 111° temperature and a 50% drop in SERPs with image (universal/vertical) results. The universal result shake-up opened up an organic position on page 1, causing substantial ranking shifts, but it’s likely that this was part of a much larger update.
Penguin 4.0: Was It Worth the Wait? (Moz)
“Possum” — September 1, 2016
While unconfirmed by Google, MozCast recorded extreme temperatures of 108° and a drop in local pack prevalence, and the local SEO community noted a major shake-up in pack results. Data suggests this update (or a simultaneous update) also heavily impacted organic results.
Everything you need to know about Google’s ‘Possum’ algorithm update (SEL)
Is a big Google search update happening? Chatter thinks so. (SEL)
Mobile-friendly 2 — May 12, 2016
Just more than a year after the original “mobile friendly” update, Google rolled out another ranking signal boost to benefit mobile-friendly sites on mobile search. Since the majority of sites we track are already mobile-friendly, it’s likely the impact of the latest update was small.
Google’s mobile-friendly algorithm boost has rolled out (SEL)
Continuing to make the web more mobile friendly (Google)
Unnamed Major Update — May 10, 2016
MozCast and other Google weather trackers showed a historically rare week-long pattern of algorithm activity, including a 97-degree spike. Google would not confirm this update, and no explanation is currently available.
Google Dismisses Any Recent Major Algorithm Update (SER)
AdWords Shake-up — February 23, 2016
Google made major changes to AdWords, removing right-column ads entirely and rolling out 4-ad top blocks on many commercial searches. While this was a paid search update, it had significant implications for CTR for both paid and organic results, especially on competitive keywords.
Four Ads on Top: The Wait Is Over (Moz)
Google AdWords Switching to 4 Ads on Top, None on Sidebar (SEM Post)
Unnamed Update — January 8, 2016
Multiple tracking tools (including MozCast) reported historically-large rankings movement, which Google later confirmed as a “core algo update”. Google officially said that this was not a Penguin update, but details remain sketchy.
Google Confirms: Core Search Ranking Update Took Place But Not Penguin Related (SER)
Panda 4.2 (#28) — July 17, 2015
Google announced what was most likely a Panda data refresh, saying that it could take months to fully roll out. The immediate impact was unclear, and there were no clear signs of a major algorithm update.
Google Panda Update: Everything We Know About Panda 4.2 (The SEM Post)
Google Panda 4.2 Is Here (SEL)
The Quality Update — May 3, 2015
After many reports of large-scale ranking changes, originally dubbed “Phantom 2”, Google acknowledged a core algorithm change impacting “quality signals”. This update seems to have had a broad impact, but Google didn’t reveal any specifics about the nature of the signals involved.
The Quality Update: Google Confirms Changing How Quality Is Assessed, Resulting In Rankings Shake-Up (SEL)
Google’s ‘phantom’ algorithm update hits websites (CNBC)
Mobile Update AKA “Mobilegeddon” — April 22, 2015
In a rare move, Google pre-announced an algorithm update, telling us that mobile rankings would differ for mobile-friendly sites starting on April 21st. The impact of this update was, in the short-term, much smaller than expected, and our data showed that algorithm flux peaked on April 22nd.
Finding more mobile-friendly search results (Google)
7 Days After Mobilegeddon: How Far Did the Sky Fall? (Moz)
Unnamed Update — February 4, 2015
Multiple SERP-trackers and many webmasters reported major flux in Google SERPs. Speculation ranged from an e-commerce focused update to a mobile usability update. Google did not officially confirm an update.
Significant Google Search Algorithm Update Yesterday (SER)
Google Brand-eCommerce “Update” causing fluctuations (Searchmetrics)
Pigeon Expands (UK, CA, AU) — December 22, 2014
Google’s major local algorithm update, dubbed “Pigeon”, expanded to the United Kingdom, Canada, and Australia. The original update hit the United States in July 2014. The update was confirmed on the 22nd but may have rolled out as early as the 19th.
Google Pigeon Update Rolls Out To UK, Canada & Australia (SEL)
Local Search Results Affected as Google Pigeon Update Hits UK (Strategy Digital)
Penguin Everflux — December 10, 2014
A Google representative said that Penguin had shifted to continuous updates, moving away from infrequent, major updates. While the exact timeline was unclear, this claim seemed to fit ongoing flux after Penguin 3.0 (including unconfirmed claims of a Penguin 3.1).
Google Says Penguin To Shift To “Continuous Updates” (SEL)
Pirate 2.0 — October 21, 2014
More than two years after the original DMCA/”Pirate” update, Google launched another update to combat software and digital media piracy. This update was highly targeted, causing dramatic drops in ranking to a relatively small group of sites.Google Pirate Update Analysis and Loser List (Searchmetrics)Google’s New Search Downranking Hits Torrent Sites Hard (TorrentFreak)
Penguin 3.0 — October 17, 2014
More than a year after the previous Penguin update (2.1), Google launched a Penguin refresh. This update appeared to be smaller than expected (<1% of US/English queries affected) and was probably data-only (not a new Penguin algorithm). The timing of the update was unclear, especially internationally, and Google claimed it was spread out over “weeks”.
Google AutoCorrects: Penguin 3.0 Still Rolling Out & 1% Impact (SER)
Penguin 3.0 Analysis – Penguin Tremors, Recoveries, Fresh Hits, and Crossing Algorithms (GSQi)
“In The News” Box — October 1, 2014
Google made what looked like a display change to News-box results, but later announced that they had expanded news links to a much larger set of potential sites. The presence of news results in SERPs also spiked, and major news sites reported substantial traffic changes.
Google’s “In The News” Box Now Lists More Than Traditional News Sites (SEL)
New Publishers Upset With Google’s “In The News” Box (SER)
Panda 4.1 (#27) — September 23, 2014
Google announced a significant Panda update, which included an algorithmic component. They estimated the impact at 3-5% of queries affected. Given the “slow rollout,” the exact timing was unclear.
Panda 4.1 — Google’s 27th Panda Update — Is Rolling Out (SEL)
Panda 4.1 Analysis and Findings – Affiliate Marketing, Keyword Stuffing, Security Warnings, and Deception Prevalent (GSQI)
Authorship Removed — August 28, 2014
Following up on the June 28th drop of authorship photos, Google announced that they would be completely removing authorship markup (and would no longer process it). By the next morning, authorship bylines had disappeared from all SERPs.
Official Announcement from John Mueller (Google+)
It’s Over: The Rise & Fall Of Google Authorship For Search Results (SEL)
HTTPS/SSL Update — August 6, 2014
After months of speculation, Google announced that they would be giving preference to secure sites, and that adding encryption would provide a “lightweight” rankings boost. They stressed that this boost would start out small, but implied it might increase if the changed proved to be positive.
HTTPS as a ranking signal (Google)
Google Starts Giving A Ranking Boost To Secure HTTPS/SSL Sites (SEL)
Pigeon — July 24, 2014
Google shook the local SEO world with an update that dramatically altered some local results and modified how they handle and interpret location cues. Google claimed that Pigeon created closer ties between the local algorithm and core algorithm(s).
Google “Pigeon” Updates Local Search Algorithm With Stronger Ties To Web Search Signal (SEL)
Google Updates Local Algo with More Web Based Signals – Turmoil in SERPs (Blumenthals.com)
Authorship Photo Drop — June 28, 2014
John Mueller made a surprise announcement (on June 25th) that Google would be dropping all authorship photos from SERPs (after heavily promoting authorship as a connection to Google+). The drop was complete around June 28th.
Google Announces the End of Author Photos in Search: What You Should Know (Moz)
Google Removes Author Photos From Search: Why And What Does It Mean? (SEL)
Payday Loan 3.0 — June 12, 2014
Less than a month after the Payday Loan 2.0 anti-spam update, Google launched another major iteration. Official statements suggested that 2.0 targeted specific sites, while 3.0 targeted spammy queries.
Google Spam Algorithm Version 3.0 Launches Today (SER)
Panda 4.0 (#26) — May 19, 2014
Google confirmed a major Panda update that likely included both an algorithm update and a data refresh. Officially, about 7.5% of English-language queries were affected. While Matt Cutts said it began rolling out on 5/20, our data strongly suggests it started earlier.
Google Begins Rolling Out Panda 4.0 Now (SEL)
Panda 4.0, Payday Loan 2.0 & eBay’s Very Bad Day (Moz)
Payday Loan 2.0 — May 16, 2014
Just prior to Panda 4.0, Google updated it’s “payday loan” algorithm, which targets especially spammy queries. The exact date of the roll-out was unclear (Google said “this past weekend” on 5/20), and the back-to-back updates made the details difficult to sort out.
Official: Google Payday Loan Algorithm 2.0 Launched: Targets “Very Spammy Queries” (SEL)
Unnamed Update — March 24, 2014
Major algorithm flux trackers and webmaster chatter spiked around 3/24-3/25, and some speculated that the new, “softer” Panda update had arrived. Many sites reported ranking changes, but this update was never confirmed by Google.
Did Google Do An Algorithm Update Yesterday? (SER)
Did the Softer Panda Update Arrive on March 24, 2014? (GSQi)
Page Layout #3 — February 6, 2014
Google “refreshed” their page layout algorithm, also known as “top heavy”. Originally launched in January 2012, the page layout algorithm penalizes sites with too many ads above the fold.
Google Updates Its Page Layout Algorithm To Go After Sites “Top Heavy” With Ads (SEL)
Authorship Shake-up — December 19, 2013
As predicted by Matt Cutts at Pubcon Las Vegas, authorship mark-up disappeared from roughly 15% of queries over a period of about a month. The fall bottomed out around December 19th, but the numbers remain volatile and have not recovered to earlier highs.
Google’s December Authorship Shake-up (Moz)
Authorshipocalypse! The Great Google Authorship Purge Has Begun (Virante)
Unnamed Update — December 17, 2013
Almost all global flux trackers registered historically high activity. Google would not confirm an update, suggesting that they avoid updates near the holidays. MozCast also registered a rise in some Partial-Match Domains (PMDs), but the patterns were unclear.
The Biggest SERP Flux Since Penguin 2.0 (Dejan SEO)
Google Denies A Major Update On December 17th (SEL)
Unnamed Update — November 14, 2013
Multiple Google trackers picked up unusual activity, which co-occurred with a report of widespread DNS errors in Google Webmaster Tools. Google did not confirm an update, and the cause and nature of this flux was unclear.
Was There a November 14th Google Update? (Moz)
Was There A Google Update On November 14th? (SER)
Penguin 2.1 (#5) — October 4, 2013
After a 4-1/2 month gap, Google launched another Penguin update. Given the 2.1 designation, this was probably a data update (primarily) and not a major change to the Penguin algorithm. The overall impact seemed to be moderate, although some webmasters reported being hit hard.
Penguin 5, With The Penguin 2.1 Spam-Filtering Algorithm, Is Now Live (SEL)
Google Penguin 2.1 Was A Big Hit (SER)
Hummingbird — August 20, 2013
Announced on September 26th, Google suggested that the “Hummingbird” update rolled out about a month earlier. Our best guess ties it to a MozCast spike on August 20th and many reports of flux from August 20-22. Hummingbird has been compared to Caffeine, and seems to be a core algorithm update that may power changes to semantic search and the Knowledge Graph for months to come.
FAQ: All About The New Google “Hummingbird” Algorithm (SEL)
Some Reports Of An August 21/22 Google Update (SER)
In-depth Articles — August 6, 2013
Google added a new type of news result called “in-depth articles”, dedicated to more evergreen, long-form content. At launch, it included links to three articles, and appeared across about 3% of the searches that MozCast tracks.
In-depth articles in search results (Google)
Inside In-depth Articles: Dissecting Google’s Latest Feature (Moz)
Unnamed Update — July 26, 2013
MozCast tracked a large Friday spike (105° F), with other sources showing significant activity over the weekend. Google has not confirmed this update.
Was There A Weekend Google Update? (SER)
MozCast Update (Google+)
Knowledge Graph Expansion — July 19, 2013
Seemingly overnight, queries with Knowledge Graph (KG) entries expanded by more than half (+50.4%) across the MozCast data set, with more than a quarter of all searches showing some kind of KG entry.
The Day the Knowledge Graph Exploded (Moz)
Panda Recovery — July 18, 2013
Google confirmed a Panda update, but it was unclear whether this was one of the 10-day rolling updates or something new. The implication was that this was algorithmic and may have “softened” some previous Panda penalties.
Confirmed: Google Panda Update: The “Softer” Panda Algorithm (SER)
Multi-Week Update — June 27, 2013
Google’s Matt Cutts tweeted a reply suggesting a “multi-week” algorithm update between roughly June 12th and “the week after July 4th”. The nature of the update was unclear, but there was massive rankings volatility during that time period, peaking on June 27th (according to MozCast data). It appears that Google may have been testing some changes that were later rolled back.
Google’s “Multi-Week” Algorithm Update (Moz)
Google’s Matt Cutts: Multi-Week Update Rolling Out (SER)
Panda Dance — June 11, 2013
While not an actual Panda update, Matt Cutts made an important clarification at SMX Advanced, suggesting that Panda was still updating monthly, but each update rolled out over about 10 days. This was not the “everflux” many people had expected after Panda #25.
Google’s Panda Dance: Matt Cutts Confirms Panda Rolls Out Monthly Over 10 Of 30 Days (SEL)
“Payday Loan” Update — June 11, 2013
Google announced a targeted algorithm update to take on niches with notoriously spammy results, specifically mentioning payday loans and porn. The update was announced on June 11th, but Matt Cutts suggested it would roll out over a 1-2 month period.
Google Payday Loan Algorithm: Google Search Algorithm Update To Target Spammy Queries (SEL)
Google Spam Algorithm For Spammy Queries: Pay Day Loans+ (SER)
Penguin 2.0 (#4) — May 22, 2013
After months of speculation bordering on hype, the 4th Penguin update (dubbed “2.0” by Google) arrived with only moderate impact. The exact nature of the changes were unclear, but some evidence suggested that Penguin 2.0 was more finely targeted to the page level.
Penguin 4, With Penguin 2.0 Generation Spam-Fighting, Is Now Live (SEL)
Penguin 2.0/4 – Were You Jarred and/or Jolted? (SEOmoz)
Domain Crowding — May 21, 2013
Google released an update to control domain crowding/diversity deep in the SERPs (pages 2+). The timing was unclear, but it seemed to roll out just prior to Penguin 2.0 in the US and possibly the same day internationally.
Google Domain Crowding Update: May 2013 (High Position)
Google Domain Clustering Update (Justin Briggs)
“Phantom” — May 9, 2013
In the period around May 9th, there were many reports of an algorithm update (also verified by high MozCast activity). The exact nature of this update was unknown, but many sites reported significant traffic loss.
A Google Update Is Happening (Google: Nothing To Announce Now) (SER)
SEO Findings From Google’s Phantom Update (GSQi)
Panda #25 — March 14, 2013
Matt Cutts pre-announced a Panda update at SMX West, and suggested it would be the last update before Panda was integrated into the core algorithm. The exact date was unconfirmed, but MozCast data suggests 3/13-3/14.
Google’s Final Manual Panda Refresh Here? #25 (SER)
Google Panda Update 25 Seems To Have Hit (SEL)
Panda #24 — January 22, 2013
Google announced its first official update of 2013, claiming 1.2% of queries affected. This did not seem related to talk of an update around 1/17-18 (which Google did not confirm).
Google Announces 24th Panda Refresh; Not Related To January 17th (SER)
Google Panda Update Version #24; 1.2% Of Search Queries Impacted (SEL)
Panda #23 — December 21, 2012
Right before the Christmas holiday, Google rolled out another Panda update. They officially called it a “refresh”, impacting 1.3% of English queries. This was a slightly higher impact than Pandas #21 and #22.
Confirmed: A Panda Refresh, Version #23 (SER)
Knowledge Graph Expansion — December 4, 2012
Google added Knowledge Graph functionality to non-English queries, including Spanish, French, German, Portuguese, Japanese, Russian, and Italian. This update was “more than just translation” and added enhanced KG capabilities.
Get smarter answers from the Knowledge Graph from Português to Japanese to Russian (Google)
Google’s Knowledge Graph Expands To More Languages, Including Italian, French, Japanese And Russian(TechCrunch)
Panda #22 — November 21, 2012
After some mixed signals, Google confirmed the 22nd Panda update, which appears to have been data-only. This came on the heels of a larger, but unnamed update around November 19th.
Official Google Panda #22 Update: November 21 (SER)
Confirmed: Google Panda Refresh #22 On November 21st; 0.8% Of Queries Impacted (SEL)
Panda #21 — November 5, 2012
Google rolled out their 21st Panda update, roughly 5-1/2 weeks after Panda #20. This update was reported to be smaller, officially impacting 1.1% of English queries.
Google Releases Panda Update 21, Impacts 1.1% Of US Queries In English (SEL)
Official: Google Panda Refresh On November 5th (Version 21) (SER)
Page Layout #2 — October 9, 2012
Google announced an update to its original page layout algorithm change back in January, which targeted pages with too many ads above the fold. It’s unclear whether this was an algorithm change or a Panda-style data refresh.
It’s “Top Heavy 2″ As Google Rolls Out Update To Its Page Layout Algorithm (SEL)
Google Page Layout Algorithm Officially Updated (SER)
Penguin #3 — October 5, 2012
After suggesting the next Penguin update would be major, Google released a minor Penguin data update, impacting “0.3% of queries”. Penguin update numbering was rebooted, similar to Panda – this was the 3rd Penguin release.
Google Penguin Update 3 Released, Impacts 0.3% Of English-Language Queries (SEL)
Google Released 3rd Penguin Update: Not Jarring Or Jolting (SER)
August/September 65-Pack — October 4, 2012
Google published their monthly (bi-monthly?) list of search highlights. The 65 updates for August and September included 7-result SERPs, Knowledge Graph expansion, updates to how “page quality” is calculated, and changes to how local results are determined.
Search quality highlights: 65 changes for August and September (Google)
Exact-Match Domain (EMD) Update — September 27, 2012
Google announced a change in the way it was handling exact-match domains (EMDs). This led to large-scale devaluation, reducing the presence of EMDs in the MozCast data set by over 10%. Official word is that this change impacted 0.6% of queries (by volume).
Google’s EMD Algo Update – Early Data (SEOmoz)
The EMD Update: Google Issues “Weather Report” Of Crack Down On Low Quality Exact Match Domains (SEL)
Panda #20 — September 27, 2012
Overlapping the EMD update, a fairly major Panda update (algo + data) rolled out, officially affecting 2.4% of queries. As the 3.X series was getting odd, industry sources opted to start naming Panda updates in order (this was the 20th).
20th Google Panda Algorithm Update: Fairly Major (SER)
How Do You Know If Google Panda Or EMD Hurt Your Site? (SER)
Panda 3.9.2 (#19) — September 18, 2012
Google rolled out another Panda refresh, which appears to have been data-only. Ranking flux was moderate but not on par with a large-scale algorithm update.
Google Rolls Out Panda 3.9.2 Refresh (SER)
Panda Update 3.92 Rolling Out (Or Is It Panda 20 Time?) (SEL)
Panda 3.9.1 (#18) — August 20, 2012
Google rolled out yet another Panda data update, but the impact seemed to be fairly small. Since the Panda 3.0 series ran out of numbers at 3.9, the new update was dubbed 3.9.1.
Confirmed: Google Panda 3.9.1 Update (SER)
Google Panda Refresh On August 19th: Version 3.9.1 (SEL)
7-Result SERPs — August 14, 2012
Google made a significant change to the Top 10, limiting it to 7 results for many queries. Our research showed that this change rolled out over a couple of days, finally impacting about 18% of the keywords we tracked.
SERP Crowding & Shrinkage: It’s Not Your Imagination (SEOmoz)
7 Is The New 10? Google Showing Fewer Results & More From Same Domain (SEL)
DMCA Penalty — August 10, 2012
Google announced that they would start penalizing sites with repeat copyright violations, probably via DMCA takedown requests. Timing was stated as “starting next week” (8/13?).
An update to our search algorithms (Google)
The Emanuel Update: Google Will Penalize Sites Repeatedly Accused Of Copyright Infringement (SEL)
June/July 86-Pack — August 10, 2012
After a summer hiatus, the June and July Search Quality Highlights were rolled out in one mega-post. Major updates included Panda data and algorithm refreshes, an improved rank-ordering function (?), a ranking boost for “trusted sources”, and changes to site clustering.
Search quality highlights: 86 changes for June and July (Google)
Google’s June-July Updates: Site Clustering, Sitelinks Changes & Focus On Page Quality (SEL)
Panda 3.9 (#17) — July 24, 2012
A month after Panda 3.8, Google rolled out a new Panda update. Rankings fluctuated for 5-6 days, although no single day was high enough to stand out. Google claimed ~1% of queries were impacted.
Official: Google Panda 3.9 Refresh (SER)
Link Warnings — July 19, 2012
In a repeat of March/April, Google sent out a large number of unnatural link warnings via Google Webmaster Tools. In a complete turn-around, they then announced that these new warnings may not actually represent a serious problem.
Insanity: Google Sends New Link Warnings, Then Says You Can Ignore Them (SEL)
Google Sends Out New Batch Of Unnatural Link Notifications (SER)
Panda 3.8 (#16) — June 25, 2012
Google rolled out another Panda data refresh, but this appeared to be data only (no algorithm changes) and had a much smaller impact than Panda 3.7.
Official Google Panda Update Version 3.8 On June 25th (SEL)
Google Panda 3.8 Live: June 25th & Refresh Only (SER)
Panda 3.7 (#15) — June 8, 2012
Google rolled out yet another Panda data update, claiming that less than 1% of queries were affect. Ranking fluctuation data suggested that the impact was substantially higher than previous Panda updates (3.5, 3.6).
Confirmed: Google Panda 3.7 Update (SER)
The Bigfoot Update (AKA Dr. Pete Goes Crazy) (SEOmoz)
May 39-Pack — June 7, 2012
Google released their monthly Search Highlights, with 39 updates in May. Major changes included Penguin improvements, better link-scheme detection, changes to title/snippet rewriting, and updates to Google News.
Search quality highlights: 39 changes for May (Google)
Google’s May Updates: Inorganic Backlinks, Page Titles, Fresh Results & More (SEL)
Penguin 1.1 (#2) — May 25, 2012
Google rolled out its first targeted data update after the “Penguin” algorithm update. This confirmed that Penguin data was being processed outside of the main search index, much like Panda data.
Google Releases Penguin Update 1.1 (SEL)
Knowledge Graph — May 16, 2012
In a major step toward semantic search, Google started rolling out “Knowledge Graph”, a SERP-integrated display providing supplemental object about certain people, places, and things. Expect to see “knowledge panels” appear on more and more SERPs over time. Also, Danny Sullivan’s favorite Trek is ST:Voyager?!
Introducing the Knowledge Graph: things, not strings (Google)
Google Launches Knowledge Graph To Provide Answers, Not Just Links (SEL)
April 52-Pack — May 4, 2012
Google published details of 52 updates in April, including changes that were tied to the “Penguin” update. Other highlights included a 15% larger “base” index, improved pagination handling, and a number of updates to sitelinks.
Search quality highlights: 52 changes for April (Google)
Google’s April Updates: Bigger & Tiered Index, Document Ranking, Sitelink Changes & More (SEL)
Panda 3.6 (#14) — April 27, 2012
Barely a week after Panda 3.5, Google rolled out yet another Panda data update. The implications of this update were unclear, and it seemed that the impact was relatively small.
Confirmed: Panda Update 3.6 Happened On April 27th (SEL)
Penguin — April 24, 2012
After weeks of speculation about an “Over-optimization penalty”, Google finally rolled out the “Webspam Update”, which was soon after dubbed “Penguin.” Penguin adjusted a number of spam factors, including keyword stuffing, and impacted an estimated 3.1% of English queries.
Another step to reward high-quality sites (Google)
The Penguin Update: Google’s Webspam Algorithm Gets Official Name (SEL)
Google Penguin Update Recovery Tips & Advice (SEL)
Two Weeks In, Google Talks Penguin Update, Ways To Recover & Negative SEO (SEL)
Panda 3.5 (#13) — April 19, 2012
In the middle of a busy week for the algorthim, Google quietly rolled out a Panda data update. A mix of changes made the impact difficult to measure, but this appears to have been a fairly routine update with minimal impact.
Google Mocks Me For Missing Panda 3.5 (SER)
Parked Domain Bug — April 16, 2012
After a number of webmasters reported ranking shuffles, Google confirmed that a data error had caused some domains to be mistakenly treated as parked domains (and thereby devalued). This was not an intentional algorithm change.
Dropped In Rankings? Google’s Mistake Over Parked Domains Might Be To Blame (SEL)
Updated: Google Update April 2012? Over SEO Penalty? (SER)
March 50-Pack — April 3, 2012
Google posted another batch of update highlights, covering 50 changes in March. These included confirmation of Panda 3.4, changes to anchor-text “scoring”, updates to image search, and changes to how queries with local intent are interpreted.
Search quality highlights: 50 changes for March (Google)
Google’s March Updates: Anchor Text, Image Search, Navigational Search & More (SEL)
Panda 3.4 (#12) — March 23, 2012
Google announced another Panda update, this time via Twitter as the update was rolling out. Their public statements estimated that Panda 3.4 impacted about 1.6% of search results.
Google Says Panda 3.4 Is ‘Rolling Out Now’ (SEL)
Search Quality Video — March 12, 2012
This wasn’t an algorithm update, but Google published a rare peek into a search quality meeting. For anyone interested in the algorithm, the video provides a lot of context to both Google’s process and their priorities. It’s also a chance to see Amit Singhal in action.
Video! The search quality meeting, uncut (Google)
Panda 3.3 (#11) — February 27, 2012
Google rolled out another post-“flux” Panda update, which appeared to be relatively minor. This came just 3 days after the 1-year anniversary of Panda, an unprecedented lifespan for a named update.
Google Confirms Panda 3.3 Update (SEL)
Confirmed: Google Panda 3.3 (SER)
February 40-Pack (2) — February 27, 2012
Google published a second set of “search quality highlights” at the end of the month, claiming more than 40 changes in February. Notable changes included multiple image-search updates, multiple freshness updates (including phasing out 2 old bits of the algorithm), and a Panda update.
Search quality highlights: 40 changes for February (Google)
Venice — February 27, 2012
As part of their monthly update, Google mentioned code-name “Venice”. This local update appeared to more aggressively localize organic results and more tightly integrate local search data. The exact roll-out date was unclear.
Understand and Rock the Google Venice Update (SEOmoz)
Google Venice Update – New Ranking Opportunities for Local SEO (Catalyst eMarketing)
February 17-Pack — February 3, 2012
Google released another round of “search quality highlights” (17 in all). Many related to speed, freshness, and spell-checking, but one major announcement was tighter integration of Panda into the main search index.
17 search quality highlights: January (Google)
Google’s January Search Update: Panda In The Pipelines, Fresher Results, Date Detection & More (SEL)
Ads Above The Fold — January 19, 2012
Google updated their page layout algorithms to devalue sites with too much ad-space above the “fold”. It was previously suspected that a similar factor was in play in Panda. The update had no official name, although it was referenced as “Top Heavy” by some SEOs.
Page layout algorithm improvement (Google)
Pages With Too Many Ads “Above The Fold” Now Penalized By Google’s “Page Layout” Algorithm (SEL)
Panda 3.2 (#10) — January 18, 2012
Google confirmed a Panda data update, although suggested that the algorithm hadn’t changed. It was unclear how this fit into the “Panda Flux” scheme of more frequent data updates.
Confirmed: Google Panda 3.2 Update (SEW)
Google Panda 3.2 Update Confirmed (SEL)
Search + Your World — January 10, 2012
Google announced a radical shift in personalization – aggressively pushing Google+ social data and user profiles into SERPs. Google also added a new, prominent toggle button to shut off personalization.
Search, plus Your World (Google)
Real-Life Examples Of How Google’s “Search Plus” Pushes Google+ Over Relevancy (SEL)
January 30-Pack — January 5, 2012
Google announced 30 changes over the previous month, including image search landing-page quality detection, more relevant site-links, more rich snippets, and related-query improvements. The line between an “algo update” and a “feature” got a bit more blurred.
30 search quality highlights – with codenames! (Google)
Google Announces “Megasitelinks,” Image Search Improvements & Better Byline Dates (SEL)
December 10-Pack — December 1, 2011
Google outlined a second set of 10 updates, announcing that these posts would come every month. Updates included related query refinements, parked domain detection, blog search freshness, and image search freshness. The exact dates of each update were not provided.
Search quality highlights: new monthly series on algorithm changes (Google)
Google: Parked Domains, Scraper Sites Targeted Among New Search Changes (SEL)
Panda 3.1 (#9) — November 18, 2011
After Panda 2.5, Google entered a period of “Panda Flux” where updates started to happen more frequently and were relatively minor. Some industry analysts called the 11/18 update 3.1, even though there was no official 3.0. For the purposes of this history, we will discontinue numbering Panda updates except for very high-impact changes.
Google Panda 3.1 Update: 11/18 (SER)
10-Pack of Updates — November 14, 2011
This one was a bit unusual. In a bid to be more transparent, Matt Cutts released a post with 10 recent algorithm updates. It’s not clear what the timeline was, and most were small updates, but it did signal a shift in how Google communicates algorithm changes.
Ten recent algorithm changes (Google)
Improved Snippets, Rank Boost For “Official” Pages Among 10 New Google Algorithm Changes (SEL)
Freshness Update — November 3, 2011
Google announced that an algorithm change rewarding freshness would impact up to 35% of queries (almost 3X the publicly stated impact of Panda 1.0). This update primarly affected time-sensitive results, but signalled a much stronger focus on recent content.
Giving you fresher, more recent search results (Google)
Google Search Algorithm Change For Freshness To Impact 35% Of Searches (SEL)
Query Encryption — October 18, 2011
Google announced they would be encrypting search queries, for privacy reasons. Unfortunately, this disrupted organic keyword referral data, returning “(not provided)” for some organic traffic. This number increased in the weeks following the launch.
Making search more secure (Google)
Google Hides Search Referral Data with New SSL Implementation (SEOmoz)
Panda “Flux” (#8) — October 5, 2011
Matt Cutts tweeted: “expect some Panda-related flux in the next few weeks” and gave a figure of “~2%”. Other minor Panda updates occurred on 10/3, 10/13, and 11/18.
Taking a Closer Look at the Google’s Panda 2.5 “Flux” (SEL)
“Minor” Google Panda Update On November 18th (SEL)
Panda 2.5 (#7) — September 28, 2011
After more than month, Google rolled out another Panda update. Specific details of what changed were unclear, but some sites reported large-scale losses.
Confirmed: Google Panda 2.5 Update Arrived This Week (SEL)
Google Panda 2.5: Losers Include Today Show, The Next Web; Winners Include YouTube, Fox News (SEL)
516 Algo Updates — September 21, 2011
This wasn’t an update, but it was an amazing revelation. Google CEO Eric Schmidt told Congress that Google made 516 updates in 2010. The real shocker? They tested over 13,000 updates.
Eric Schmidt’s Congressional Testimony (SEL)
Pagination Elements — September 15, 2011
To help fix crawl and duplication problems created by pagination, Google introduced the rel=”next” and rel=”prev” link attributes. Google also announced that they had improved automatic consolidation and canonicalization for “View All” pages.
Pagination with rel=“next” and rel=“prev” (Google)
Google Provides New Options for Paginated Content (SEL)
Expanded Sitelinks — August 16, 2011
After experimenting for a while, Google officially rolled out expanded site-links, most often for brand queries. At first, these were 12-packs, but Google appeared to limit the expanded site-links to 6 shortly after the roll-out.
The evolution of sitelinks: expanded and improved (Google)
Official: Google Sitelinks Expands To 12 Pack (SEL)
Panda 2.4 (#6) — August 12, 2011
Google rolled Panda out internationally, both for English-language queries globally and non-English queries except for Chinese, Japanese, and Korean. Google reported that this impacted 6-9% of queries in affected countries.
High-quality sites algorithm launched in additional languages (Google)
Google’s Panda Update Launches Internationally in Most Languages (SEL)
Panda 2.3 (#5) — July 23, 2011
Webmaster chatter suggested that Google rolled out yet another update. It was unclear whether new factors were introduced, or this was simply an update to the Panda data and ranking factors.
Official: Google Panda 2.3 Update Is Live (SEL)
A Holistic Look at Panda with Vanessa Fox (Stone Temple)
Google+ — June 28, 2011
After a number of social media failures, Google launched a serious attack on Facebook with Google+. Google+ revolved around circles for sharing content, and was tightly integrated into products like Gmail. Early adopters were quick to jump on board, and within 2 weeks Google+ reached 10M users.
Introducing the Google+ project: Real-life sharing, rethought for the web (Google)
Larry Page On Google+: Over 10 Million Users, 1 Billion Items Being Shared Per Day (TechCrunch)
Panda 2.2 (#4) — June 21, 2011
Google continued to update Panda-impacted sites and data, and version 2.2 was officially acknowledged. Panda updates occurred separately from the main index and not in real-time, reminiscent of early Google Dance updates.
Official: Google Panda Update 2.2 Is Live (SEL)
Why Google Panda Is More A Ranking Factor Than Algorithm Update (SEL)
Schema.org — June 2, 2011
Google, Yahoo and Microsoft jointly announced support for a consolidated approach to structured data. They also created a number of new “schemas”, in an apparent bid to move toward even richer search results.
Google, Bing & Yahoo Unite To Make Search Listings Richer Through Structured Data (SEL) What is Schema.org?(Schema.org)
Panda 2.1 (#3) — May 9, 2011
Initially dubbed “Panda 3.0”, Google appeared to roll out yet another round of changes. These changes weren’t discussed in detail by Google and seemed to be relatively minor.
It’s Panda Update 2.1, Not Panda 3.0, Google Says (SEL)
Google Panda 3.0 (SERoundtable)
Panda 2.0 (#2) — April 11, 2011
Google rolled out the Panda update to all English queries worldwide (not limited to English-speaking countries). New signals were also integrated, including data about sites users blocked via the SERPs directly or the Chrome browser.
High-quality sites algorithm goes global, incorporates user feedback (Google)
Panda 2.0: Google Rolls Out Panda Update Internationally & Incorporates Searcher Blocking Data (SEL)
The +1 Button — March 30, 2011
Responding to competition by major social sites, including Facebook and Twitter, Google launched the +1 button (directly next to results links). Clicking [+1] allowed users to influence search results within their social circle, across both organic and paid results.
Recommendations when you want them (Google)
Meet +1: Google’s Answer To The Facebook Like Button (SEL)
Panda/Farmer — February 23, 2011
A major algorithm update hit sites hard, affecting up to 12% of search results (a number that came directly from Google). Panda seemed to crack down on thin content, content farms, sites with high ad-to-content ratios, and a number of other quality issues. Panda rolled out over at least a couple of months, hitting Europe in April 2011.
The ‘Panda’ That Hates Farms: A Q&A With Google’s Top Search Engineers (Wired)
Google’s Farmer/Panda Update: Analysis of Winners vs. Losers (SEOmoz)
Attribution Update — January 28, 2011
In response to high-profile spam cases, Google rolled out an update to help better sort out content attribution and stop scrapers. According to Matt Cutts, this affected about 2% of queries. It was a clear precursor to the Panda updates.
Algorithm Change Launched (Matt Cutts)
Latest Google Algorithm change (Search News Central)
Overstock.com Penalty — January 2011
In a rare turn of events, a public outing of shady SEO practices by Overstock.com resulted in a very public Google penalty. JCPenney was hit with a penalty in February for similar bad behavior. Both situations represented a shift in Google’s attitude and foreshadowed the Panda update.
Google Penalizes Overstock for Search Tactics (WSJ)
Overstock.com’s Google Rankings – Too Good? (WMW)
Social Signals — December 2010
Google and Bing confirmed that they use social signals in determining ranking, including data from Twitter and Facebook. Matt Cutts confirmed that this was a relatively new development for Google, although many SEOs had long suspected it would happen.
What Social Signals Do Google & Bing Really Count? (SEL)
Google Webmaster Video Reconfirms Use Of Social Signals (SEL)
Negative Reviews — December 2010
After an expose in the New York Times about how e-commerce site DecorMyEyes was ranking based on negative reviews, Google made a rare move and reactively adjusted the algorithm to target sites using similar tactics.
A Bully Finds a Pulpit on the Web (NY Times)
Being bad to your customers is bad for business (Google)
Instant Previews — November 2010
A magnifying glass icon appeared on Google search results, allowing search visitors to quickly view a preview of landing pages directly from SERPs. This signaled a renewed focus for Google on landing page quality, design, and usability.
Beyond Instant Results: Instant Previews (Google)
Google Instant — September 2010
Expanding on Google Suggest, Google Instant launched, displaying search results as a query was being typed. SEOs everywhere nearly spontaneously combusted, only to realize that the impact was ultimately fairly small.
About Google Instant (Google)
Google Instant: Fewer Changes to SEO than the Average Algo Update (SEOmoz)
Brand Update — August 2010
Although not a traditional algorithm update, Google started allowing the same domain to appear multiple times on a SERP. Previously, domains were limited to 1-2 listings, or 1 listing with indented results.
Google Search Results Dominated By One Domain (SEL)
Caffeine (Rollout) — June 2010
After months of testing, Google finished rolling out the Caffeine infrastructure. Caffeine not only boosted Google’s raw speed, but integrated crawling and indexation much more tightly, resulting in (according to Google) a 50% fresher index.
Our new search index: Caffeine (Google)
Google’s New Indexing Infrastructure “Caffeine” Now Live (SEL)
May Day — May 2010
In late April and early May, webmasters noticed significant drops in their long-tail traffic. Matt Cutts later confirmed that May Day was an algorithm change impacting the long-tail. Sites with large-scale thin content seemed to be hit especially hard, foreshadowing the Panda update.
Google Search Results Dominated By One Domain (SEL)
Video: Google’s Matt Cutts On May Day Update (SERoundtable)
Google Places — April 2010
Although “Places” pages were rolled out in September of 2009, they were originally only a part of Google Maps. The official launch of Google Places re-branded the Local Business Center, integrated Places pages more closely with local search results, and added a number of features, including new local advertising options.
Google Local Business Center Becomes “Google Places” (SEL)
Introducing Google Places (Google)
Big Daddy — December 2005
Technically, Big Daddy was an infrastructure update (like the more recent “Caffeine”), and it rolled out over a few months, wrapping up in March of 2006. Big Daddy changed the way Google handled URL canonicalization, redirects (301/302) and other technical issues.
Indexing timeline (MattCutts.com)
Todd, Greg & Matt Cutts on WebMasterRadio (SEOmoz)
Jagger — October 2005
Google released a series of updates, mostly targeted at low-quality links, including reciprocal links, link farms, and paid links. Jagger rolled out in at least 3 stages, from roughly September to November of 2005, with the greatest impact occurring in October.
A Review Of The Jagger 2 Update (SERoundtable)
Dealing With Consequences of Jagger Update (WMW)
Google Local/Maps — October 2005
After launching the Local Business Center in March 2005 and encouraging businesses to update their information, Google merged its Maps data into the LBC, in a move that would eventually drive a number of changes in local SEO.
Google Merges Local and Maps Products (Google)
Gilligan — September 2005
Also called the “False” update ? webmasters saw changes (probably ongoing), but Google claimed no major algorithm update occurred. Matt Cutts wrote a blog post explaining that Google updated (at the time) index data daily but Toolbar PR and some other metrics only once every 3 months.
Google’s Cutts Says Not An Update – I Say An Update, Just Not A Dance (SEW)
What?s an update? (MattCutts.com)
Personalized Search — June 2005
Unlike previous attempts at personalization, which required custom settings and profiles, the 2005 roll-out of personalized search tapped directly into users? search histories to automatically adjust results. Although the impact was small at first, Google would go on to use search history for many applications.
Google Relaunches Personal Search – This Time, It Really Is Personal (SEW)
Search gets personal (Google)
XML Sitemaps — June 2005
Google allowed webmasters to submit XML sitemaps via Webmaster Tools, bypassing traditional HTML sitemaps, and giving SEOs direct (albeit minor) influence over crawling and indexation.
New “Google Sitemaps” Web Page Feed Program (SEW)
Bourbon — May 2005
“GoogleGuy” (likely Matt Cutts) announced that Google was rolling out “something like 3.5 changes in search quality.” No one was sure what 0.5 of a change was, but Webmaster World members speculated that Bourbon changed how duplicate content and non-canonical (www vs. non-www) URLs were treated.
Google Update “Bourbon” (Batelle Media)
Bourbon Update Survival Kit (SERoundtable)
Allegra — February 2005
Webmasters witnessed ranking changes, but the specifics of the update were unclear. Some thought Allegra affected the “sandbox” while others believed that LSI had been tweaked. Additionally, some speculated that Google was beginning to penalize suspicious links.
Google’s Feb. 2005 Update (SEW)
Nofollow — January 2005
To combat spam and control outbound link quality, Google, Yahoo, and Microsoft collectively introduce the “nofollow” attribute. Nofollow helps clean up unvouched for links, including spammy blog comments. While not a traditional algorithm update, this change gradually has a significant impact on the link graph.
Google, Yahoo, MSN Unite On Support For Nofollow Attribute For Links (SEW)