Facebook 'quite sure' it didn't sign ownership pact, CEO says

Facebook Inc., facing a lawsuit from a New York man claiming an agreement entitles him to 84 percent of the company, is "quite sure" it never signed such a contract, Chief Executive Officer Mark Zuckerberg said.

Zuckerberg, speaking in a TV interview with ABC News, was responding to an earlier comment from Facebook lawyer Lisa Simpson, who told a judge the company was "unsure" if he had signed a contract. Paul Ceglia sued Facebook and Zuckerberg in New York state court, claiming that an April 2003 agreement entitles him to ownership of most of the closely held company.