Google has always known for its experiments and efforts to make Search Engines free from Spammers, Scammers, Content Violations and to make Internet more secure by making changes and updates into their Algorithm. The year 2011 was the biggest year for Google Algorithm Updates because in this year Google made several changes into their Algorithm which affects almost 40% of its Search Ranking and Queries in Search Engines. Some of the Major Algorithm Changes And Updates of 2011 is Google Panda, Google+ Plus 1, Google UI Update etc.

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