In February 2011, Google Panda Update was released. The purpose of this algorithm was to filter low quality content from Google's top search results. The update worked by re-evaluating the overall net content, aiming to send low quality sites to the bottom of search engine results and high quality ones to the top.
In fact, the first operation was very complex and has required several updates over the past year. Here is a list of the many different updates that have hit since February 2011:
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