The case, which has been running for over three years, is between Facebook and rival social networking site ConnectU.
A decision, which is due on Wednesday 25 July in a federal court in the US will determine whether Facebook's founder Mark Zuckerberg copied the code for the network from three fellow Harvard students.
Cameron and Tyler Winklevoss, and Divya Narendra claim Zuckerberg took the source code to their site and business plan and used them to launch Facebook in 2003 while he was a programmer for their site.
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