Facebook could not be immediately reached for comment.
Yahoo has also alleged that Facebook has infringed two other patents. The first patent called: "System and method to determine the validity of and interaction on a network," bearing U.S. Patent No. 7,933,903, was issued by the U.S. Patent and Trademark Office to Yahoo in April, 2011, while the other U.S. Patent No. 7,698,315, titled "System and method allowing advertisers to manage search listings in a pay for placement search system using grouping," was issued by the USPTO on April 13, 2010.
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