Cameron and Tyler Winklevoss, who yesterday settled a long-running court case against Facebook for a payout of £48 million, have filed a new lawsuit against the social networking site and its CEO, Mark Zuckerberg.

The new case, filed in Boston, suggests that Facebook and Zuckerberg "intentionally or inadvertently suppressed evidence" in the recently-settled lawsuit.

The Winklevosses and their partner Divya Narendra have long maintained that Mark Zuckerberg stole their idea for a social network while at Harvard University, repurposed it into Facebook and became the mega multimillionaire that he is today.

Zuckerberg created Facebook in 2004 in his Harvard University dormitory room.

The seven-year battle between the parties, who all attended Harvard University, was portrayed in the 2010 film "The Social Network."

The filing claims that Facebook and other parties withheld evidence from the Winklevosses and their lawyers.

In a bizarre twist, the twin's new legal team are having trouble getting files from their old legal team.

The brothers are not appealing the settlement they got in 2008, however, and they say they will not, as was suggested, take their earlier complaints up to the US Supreme Court and ask for a bigger settlement.

However, if the courts rule in favour of the Winklevosss in this new case, it could give the twins the fuel they need to re-open the previous case and continue their endless quest for justice.

Analysts have estimated that Palo Alto, California-based Facebook could be worth $70 billion or more should it conduct an initial public offering, perhaps in early 2012.