Variety‘s Michael Fleming reported today that three key roles in David Fincher‘s The Social Network — a.k.a., the “Facebook movie” by way of Treasure of Sierra Madre — have been cast. Jesse Eisenberg will play Facebook CEO Mark Zuckerberg (rumored, expected); Justin Timberlake will play Sean Parker, the Napster co-founder who became Facebook’s founding president; and Andrew Garfield (Red Riding) will play Eduardo Saverin, the Facebook co-founder who fell out with Zuckerberg over money. The Scott Rudin-produced, Aaron Sorkin-scripted drama will shoot next month in Boston and then move to Los Angeles. Sony will distribute.