"We believe this suit is completely frivolous and we will fight it vigorously," Andrew Noyes, a Facebook spokesman, said in an e-mail to Computerworld last July after the initial suit was filed.

Facebook also previously went so far as to contend that any contracts Ceglia produced for the courts .

In the amended court document, which was filed on Monday in U.S. District Court in the Western District Of New York, Ceglia lists emails in which Zuckerberg allegedly refers to Ceglia's investment in the startup several times.

In an email Ceglia says was sent on Jan. 1, 2004, Zuckerberg is said to have written: "The extra $1000 really helped get us further ahead and if there is any way you can send some additional funding I believe we will be online in a few weeks."

And in an alleged email dated Feb. 2, 2004, Zuckerberg is said to have written about his ownership agreement with Ceglia.