BUFFALO, N.Y. — A man suing for part ownership of Facebook must give lawyers for the social networking company access to every e-mail he’s exchanged since 2003, a federal judge ruled today.

Judge Richard Arcara denied Paul Ceglia’s request to delay Facebook’s access to his e-mails so he could object on privacy grounds.

It was the latest in a series of court rulings that have gone Facebook’s way as the Palo-Alto, Calif.-based company and its founder, Mark Zuckerberg, aggressively defend against Ceglia’s claims that Zuckerberg signed away half of Facebook before it got off the ground.

Lawyers for Facebook, estimated to be worth $50 billion or more, say the lawsuit is a fraud.

Today’s ruling came after Ceglia’s lawyers sought to delay first all, then part, of an Aug. 18 order compelling him to produce, by this past Monday, additional materials and his e-mail accounts on top of a raft of computers, disks and saved e-mails he’s already made available.

When a judge on Friday refused to stay the entire order, Ceglia sought Monday to protect just his e-mail accounts.

By The Associated Press