Pragmatus AV [NPE] filed suit against Yahoo over five patents related to the Yahoo! Messenger application.  The patents-in-suit were assigned to Avistar and Intellectual Ventures before being sold to Pragmatus AV in June 2010.  Pragmatus AV, and its related entity Pragmatus VOD, are both subsidiaries of Altitude Capital Partners and have each filed one prior suit.  Pragmatus AV filed suit in February 2011 against Facebook, LinkedIn, Photobucket, and YouTube while Pragmatus VOD filed suit in January 2011 against nine communications companies including Comcast, Cox, and Time Warner.  10/4, District of Delaware, 1:2011cv00902.