That will be up to a federal court to decide.

Earlier this week, Paul D. Ceglia of Wellsville, N.Y., amended his claiming that he's owed a full 50% of Zuckerberg's stake in the social networking company.

Ceglia had initially filed a lawsuit against Zuckerberg last year and then amended it this week by adding what he says is email evidence showing that Zuckerberg gave him 50% ownership in Facebook for an investment in the then-startup company. According to court documents, Ceglia claims he had a written agreement with to design and build the site that eventually turned into the wildly successful Facebook.

The initial suit alleged that Ceglia received a 50% stake in the company under the written agreement to work on the site. Ceglia contended that the agreement would add 1% to his stake for every extra day of work. That, according to Ceglia's initial suit, added up to an 84% ownership of the social network, which now has more than .

Facebook did not respond to a request to comment today on the amended suit but had previously stated that there was no basis to the case.