Facebook is suing several law firms that represented a man who claimed he owned half of the social network and was entitled to billions of dollars from the company and its CEO Mark Zuckerberg.
The case was dismissed in April and the man, Paul Ceglia, is facing related criminal charges. Facebook Inc and Zuckerberg filed a lawsuit on Tuesday against DlA Piper and other law firms and lawyers, saying they conspired to file and prosecute a fraudulent lawsuit.