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Which Claims Have Been Violated By Facebook Causing Rembrandt Social Media To Sue For Infringement?

Quite confused as to which claims are violated by Facebook and AddThis.com, causing them to sue last month. Reference: http://www.prnewswire.com/news-releases/fish--richardson-files-patent-infringement-lawsuit-for-rembrandt-social-media-in-virginia-against-facebook-add-this-inc-189859931.html