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Google frequently tweaks its algorithm to target sites with low-quality content, particularly those that scrape content. Google calls these updates “Panda.”

The first one came out in February 2011 and the latest kicked into gear on April 19, 2012.

Google says, “We’re continuing to iterate on our Panda algorithm as part of our commitment to returning high-quality sites to Google users. This most recent update is one of the over 500 changes we make to our ranking algorithms each year.”