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Ceglia’s lead attorney, Dean Boland, of Lakewood, Ohio, said the lawsuit can’t be dismissed just because the findings of Facebook’s experts contradict those of Ceglia’s experts. He accused Facebook of trying to end the case before being required by the court to provide any evidence or have it heard by a jury.

So far, all of the preliminary court proceedings have focused on the authenticity of Ceglia’s documents. Facebook, which has been given access to Ceglia’s computers, email accounts, storage devices and other materials, has not yet had to turn anything over in exchange, including the estimated 300 emails recovered from the Harvard server, many of which were included in Monday’s filings.

Mr. Ceglia deserves his day in court, where the jury will resolve this dispute over the ownership of Facebook,” a statement from Ceglia’s legal team said.

Facebook, based in Menlo Park, Calif., has 845 million active users. It employs more than 3,200 people, the company said, adding that users spend more than 10.5 billion minutes per day on the site.

An upcoming initial public offering of stock could value Facebook at as much as $100 billion.

In 2008, Facebook agreed to pay Cameron and Tyler Winklevoss $65 million to settle their claims that Zuckerberg stole the idea for Facebook from them and a third person at Harvard.