Justin Timberlake for Facebook Flick September 4, 2009 Cast Set for David Fincher’s Social Network? David Fincher has reportedly found his cast for The Social Network, According to reports, Jesse Eisenberg (Adventureland) is set to play Mark Zuckerberg, the now 25-year-old CEO of Facebook with a net worth over $100 million. Pop entertainer Justin Timberlake is on board as Sean Parker, the entrepreneur who created Napster and became Facebook’s President when they incorporated in 2004. Andrew Garfield (Boy A) will play Eduardo Saverin, one of the social networking site’s co-founders. Aaron Sorkin is on board to write the script, based on the novel “The Accidental Billionaires”.