After losing several rounds in lower courts, Cameron and Tyler Winklevoss are now planning to take the Facebook case to Supreme Court.

The 9th Circuit Court of Appeals recently refused to re-open the twins' case against Mark Zuckerberg, the founder and chief of the world's most popular social-networking site Facebook.

The twins wanted the court to reconsider its April ruling in which it uphold the $65 million settlement from 2008. The settlement gave them $20 million in cash and $45 million in stock.

The twins claim that they were tricked by Mark Zuckerberg during negotiations for the settlement by concealing information about the actual value of the Facebook stock. They insist that the actual value of the settlement was less than half what they were made to believe.

Speaking on the topic, the Winklevoss brothers said, "The Court's decision shut the courthouse door to a solid claim that Facebook obtained this settlement by committing securities fraud. Our Petition to the Supreme Court will ask the high court to decide whether that door should be reopened."

On the other hand, a spokesperson for Facebook said they were pleased with the court's latest decision.