New 'Facebook' movie friends: Justin Timberlake, Jesse Eisenberg, Andrew Garfield

David Fincher's Facebook movie is adding a few friends.

Justin Timberlake has signed on to "The Social Network" as Facebook founding president Sean Parker; Jesse Eisenberg will play founder Mark Zuckerberg; and Andrew Garfield will take the part of Zuckerberg's co-founder and then rival Eduardo Saverin.

The film will follow the site's early days as a Harvard-based student community and its rise as one of the Web's foremost social gathering places. Of course, it's not an easy transition, based on the description of the falling out between Zuckerberg and Saverin.

Filming begins this October in Boston.

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