Google Penguin

Google Penguin is a code 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 by using now declared 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. Unlike PageRank, however, Google has announced all updates to this algorithm to the public.

Penguin’s effect on Google search results
By Google’s estimates,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, 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, but it seems some legitimate sites and SEOs have been caught with this latest algorithm change. Few websites lost search rankings on Google for specific keywords during the Panda and Penguin rollouts. It appears anchor text was to blame in these cases, as the links pointing to these sites concentrated on only one or a few keywords while the content of the websites was satisfactory. As the update focused on the quality of backlinks, so the result varied for different websites. Google specifically mentions that doorway pages, which are only built to attract search engine traffic, are against their webmaster guidelines. Regardless, many people still use this technique. Readmore...

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