Paul Ceglia claims that Facebook CEO Mark Zuckerberg gave him an 84 percent stake in Facebook. Is he telling the truth? “Of course not,” Zuckerberg tells Fortune. “It was all about his website. I hadn’t even thought of Facebook yet. How could I have given him an ownership interest in it?” Ceglia hired Zuckerberg in April 2003 and claims he lent him $1,000 in exchange for an 84 percent stake in an undertaking Zuckerberg was calling “The Face Book.” Zuckerberg claims he did not get the idea for Facebook until the fall of 2003 and did not begin programming it until January 2004. Ceglia’s case against Zuckerberg is currently before a federal court in Buffalo.