Mark Zuckerberg creates Facebook after a breakup with his girlfriend at Harvard. He builds the social network with his friend Eduardo Saverin's financial backing but later cuts Saverin out of the company. The Winklevoss twins sue Zuckerberg, claiming he stole their idea for a social network, and they reach a $65 million settlement. As Facebook grows rapidly, legal issues arise over ownership and expansion plans that damage friendships but propel the company to massive success.