By Maggie Shiels Technology reporter, BBC News, San Francisco
Three men who say Mark Zuckerberg stole the Facebook concept from them have asked a US appeals court to re-open a $65m (£42m) legal settlement signed in 2008 with the company.
Cameron and Tyler Winklevoss and Divya Narendra argue Facebook undervalued its share price when they struck the deal.
With the company now valued at about $50bn, they charge the deception cost them millions and they want more money.
A lower court ruled the accord was binding and should stand.
Now the Ninth Circuit Court of Appeals in San Francisco is considering the men's request to sue Facebook all over again.
If granted, it would mean the trio could pursue their lawsuit against Mr Zuckerberg for more money and an admission that the idea for Facebook was stolen when he did some work for them.
Facebook agreed to the 2008 settlement to end "rancorous litigation" but did not admit Mr Zuckerberg had taken their idea.
Mr Zuckerberg, who was at Harvard with the three men, has always said Facebook was his creation.
Today it is the world's biggest social network with over 500m users, and Mr Zuckerberg is one of the world's youngest billionaires.
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