What are Google Updates Pigeon, Panda, Penguin, Hummingbird?

< object type="application/x-shockwave-flash" style="width:425 px; height:355 px;" information ="// http://www.youtube.com/v/4uToeFD7bXM?color2=FBE9EC&version=3&modestbranding=1" >< param name="movie" worth ="// http://www.youtube.com/v/4uToeFD7bXM?color2=FBE9EC&version=3&modestbranding=1"/ >< param name="allowFullScreen" worth="true"/ > In this video, John E Lincoln, a teacher at UCSD and President of Ignite Exposure, briefly describes the various between the four significant Google update Pigeon, Panda, Penguin and Hummingbird. http://ift.tt/1FtpxHD

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