A New York man who claims he's entitled to a sizable stake in Facebook has amended his initial complaint, adjusting his ownership claim and providing additional documents, including e-mails he allegedly exchanged with Mark Zuckerberg.

Paul Ceglia now claims that he owns 50% of Facebook, a stake he alleges he contractually acquired by investing $1,000 in the venture back in April 2003, when the social-networking site was an early stage project and idea Zuckerberg was working on.

Should Ceglia succeed in his claim, his $1,000 investment would net him a stake worth about $25 billion, according to the most recent Facebook valuation, in what is now one of the most popular and successful websites in the world.

In addition to a copy of a contract he and Zuckerberg allegedly signed back then, Ceglia has now also provided the text of a series of e-mails the two men exchanged between 2003 and 2004.

Full story: Computerworld