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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. 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. Responding to competition by major social sites, including Facebook and Twitter, Google launched the +1 button . Clicking [+1] allowed users to influence search results within their social circle, across both organic and paid results.
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Algorithm tracking tools and webmaster chatter showed heavy activity, but Google did not confirm an update. MozCast showed very high temperatures over a 3-day period, peaking on May 23. Ranking trackers and webmaster chatter registered a week of heavy flux (MozCast peaked at 95°F on July 16) that was later dubbed the «Maverick» update by the search community.
Rank tracking tools and webmaster chatter suggested a significant update, with MozCast measuring 101°F, but no update was confirmed by Google. Some industry analysts suggested the changes were rolled back the next day and may have been temporary. While this update officially wrapped up at the end of November, most tracking sites showed a strong single-day spike (with MozCast hitting 101.7°F on November 17). The overlap with Black Friday sparked controversy in the SEO community. To combat spam and control outbound link quality, Google, Yahoo, and Microsoft collectively introduce the «nofollow» attribute.
Penguin update numbering was rebooted, similar to Panda — this was the 3rd Penguin release. 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. Google announced a significant Panda update, which included an algorithmic component.
Google Allo was a mobile instant messaging app developed for Android and iOS to exchange messages, images, files, and videos. YouTube — Video service that allows users to freely upload videos and view others videos. Google Toolbar — For Microsoft Windows Internet Explorer and Firefox users. Google Toolbar add-on enables users using these browsers to have access to Google search and other Google features any time the browser is open.
Big Daddy changed the way Google handled URL canonicalization, redirects (301/302) and other technical issues. There were stirrings about an update in December, along with some reports of major ranking changes in November, but Google reported no major changes. Google released a preview of a massive infrastructure change, designed to speed crawling, expand the index, and integrate indexation and ranking in nearly real-time.
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. 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. After testing longer search snippets for over two years, Google increased them across a large number of results.
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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. Right before the Christmas holiday, Google rolled out another Panda update. They officially called it a «refresh», impacting 1.3% of English queries. Google released an update to control domain crowding/diversity deep in the SERPs (pages 2+).