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Google Penguin is a codename〔(Penguin Gets Official Name )〕 for a Google algorithm update that was first announced on April 24, 2012. The update is aimed at decreasing search engine rankings of websites that violate Google’s Webmaster Guidelines〔(Webmaster Guidelines - Webmaster Tools Help )〕 by using now declared Link schemes - Webmaster Tools Help )〕 According to Google's John Mueller (technology)" TITLE="black-hat SEO techniques involved in increasing artificially the ranking of a webpage by manipulating the number of links pointing to the page. Such tactics are commonly described as link schemes.〔(Link schemes - Webmaster Tools Help )〕 According to Google's John Mueller (technology)">John Mueller, Google has announced all updates to the Penguin filter to the public.〔(【引用サイトリンク】author=Barry Schwartz )〕 ==Effect on search results== By Google’s estimates,〔(Another step to reward high-quality sites - Inside Search )〕 Penguin affects approximately 3.1% of search queries in English, about 3% of queries in languages like German, Chinese, and Arabic, and an even bigger percentage of them in "highly spammed" languages. On May 25, 2012, Google unveiled another Penguin update, called Penguin 1.1. This update, according to Matt Cutts, head of webspam at Google, was supposed to affect less than one-tenth of a percent of English searches. The guiding principle for the update was to penalize websites using manipulative techniques to achieve high rankings. The purpose per Google was to catch excessive spammers. Allegedly, few websites lost search rankings on Google for specific keywords during the Panda and Penguin rollouts. Google specifically mentions that doorway pages, which are only built to attract search engine traffic, are against their webmaster guidelines. In January 2012, the so-called Page Layout Algorithm Update〔(Official Google Webmaster Central Blog: Page layout algorithm improvement )〕 (also known as the Top Heavy Update) was released, which targeted websites with too many ads, or too little content above the fold. Penguin 3 was released October 5, 2012 and affected 0.3% of queries. Penguin 4 (AKA Penguin 2.0) was released on May 22, 2013 and affected 2.3% of queries. Penguin 5 (AKA Penguin 2.1) was released on October 4, 2013, affected around 1% of queries, and has been the most recent of the Google Penguin algorithm updates. Google may have released Penguin 3.0 on October 18, 2014. On October 21, 2014, Google's Pierre Farr confirmed that Penguin 3.0 was an algorithm "refresh", with no new signals added. On April 7, 2015, Google's John Mueller said in a Google+ hangout that both Penguin and Panda "currently are not updating the data regularly" and that they need to kind of be pushed out manually. This confirms that the algorithm is not updated continuously which was believed to be the case earlier on in the year. The strategic goal that Panda, Penguin, and the page layout update share is to display higher quality websites at the top of Google’s search results. However, sites that were downranked as the result of these updates have different sets of characteristics. The main target of Google Penguin is spamdexing (including link bombing). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Google Penguin」の詳細全文を読む スポンサード リンク
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