"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.
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