http://seovigyan.com/2011/02/google-farmer-algorithm-2011-update/
http://googleblog.blogspot.com/2011/02/finding-more-high-quality-sites-in.html
http://www.leadsleap.com/blog/googles-algorithm-change-in-2011-and-its-impact/
http://googleblog.blogspot.com/2011/02/finding-more-high-quality-sites-in.html
http://www.leadsleap.com/blog/googles-algorithm-change-in-2011-and-its-impact/
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