What's the best way to announce new cast for a movie about Facebook? On Facebook, of course! The Playlist tracked down a series of tweets and Facebook posts to discover that several young actors have been added to the cast of The Social Network, a movie already starring Jesse Eisenberg, Justin Timberlake and Andrew Garfield.

They're mostly names you won't know, so we may as well hear it in Sorkin's own Facebook words:

"Rehearsals began yesterday for The Social Network. The ensemble cast includes Jesse Eisenberg, Andrew Garfield, Justin Timberlake, Max Minghella, Rooney Mara, Dakota Johnson, Brenda Song, Armie Hammer, Josh Pence and about 20 others to come. Shooting begins Oct. 19th in Cambridge, MA."

20 others? Good Lord, it's like the "Night of a Thousand Stars" for the under-25 set. Minghella will apparently be pulling a Hayley Mills and playing a set of twins, the Winklevoss twins , according to, of all things, Richard Kelly's Twitter. Seriously, the social network paper trail is just endless. According to this summary of the legal drama that has beset Zuckerberg ever since founding Facebook, the Winklevoss twins were among the group that initially came up with the idea for ConnectU, who hired Zuckerberg to work for them and then were stunned when he ditched them and founded Facebook on his own.