Timeline of Google Search
21/22 Google Update". Search Engine Roundtable. Retrieved February 2, 2014. Sullivan, Danny (October 4, 2013). "Penguin 5, With The Penguin 2.1 Spam-Filtering
Google penguin updates past, present and future
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In April 2012, Google launched Penguin algorithm update – aimed at decreasing the rankings of websites that manipulated the number of backlinks pointing to them. This update, had a huge impact, changing the Internet we used to know for good.