Facebook has presented evidence that it describes as a "smoking gun" in the ownership case filed by Paul Ceglia.
Lawyers for the social network have filed a document saying that a contract submitted by Ceglia as evidence in his ownership claim was actually a doctored version of another contract.
Having claimed that he bought an 84 per cent stake in Facebook before it became the multi-million dollar business it is today, Ceglia produced the agreement in question which was signed by both him and Facebook founder Mark Zuckerberg.
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The contract appeared to show Zuckerberg agreeing to build a website called "The Face Book" or "The Page Book".
However, Facebook says that forensic testing has revealed that this contract actually relates to a website called StreetFax and makes no mention of Facebook at all.
"The court-ordered forensic testing has uncovered the authentic contract between Mark Zuckerberg and StreetFax that Ceglia attempted to conceal," the Facebook filing said.
"This smoking-gun evidence confirms what Defendants have said all along: the purported contract attached to the complaint is an outright fabrication.
"The authentic contract - which mentions only StreetFax and has nothing to do with Facebook - was found embedded in the electronic data from 2004 on Ceglia's computer."
In July of this year, Ceglia's lawyers - they of the "we did weeks of due diligence to validate his evidence" claims - became the fourth firm to ditch him and his foundering court case.
Facebook is now looking to the court for a dismissal of the case based on "the now-overwhelming evidence of Ceglia's fraud, spoliation and subterfuge."