Cameron, left, and Tyler Winklevoss are have filed a lawsuit in Boston federal court after they decided not to appeal to the U.S. Supreme Court a ruling upholding their $65 million settlement with Facebook Inc. and its founder Mark Zuckerberg. (ADAM HUNGER/REUTERS)

The men claim that Facebook CEO and co-founder Mark Zuckerberg took the idea for Facebook from their product ConnectU. The twins, along with business partner Divya Narendra, received a $65 million settlement from Facebook in 2008, but then moved to have the settlement thrown out.

An appeals court judge denied their request in April. On Wednesday, the men opted not to appeal that decision to the Supreme Court, seemingly ending years of litigation.

But the Los Angeles Times broke the news Thursday night that the legal battle will continue and the men have asked the Boston court to examine their claims that Facebook withheld information from them.

The twins claim that Facebook kept instant messages Zuckerberg sent to a friend saying that he was holding off on making Harvard Connect, as ConnectU was called at the time, until after the launch of Facebook. The Winklevosses and Narendra said they would not have settled if they had access to that information.

Neel Chatterjee, an attorney for Facebook, told the newspaper, “These are old and baseless allegations that have been considered and rejected previously by the courts.”

Related stories:

Winklevoss twins will not appeal in Facebook case

PHOTOS: Titans of the technology industry

Post Tech: Facebook says ownership suit is based on forged documents