Alhough these casting rumors have been floating around for several weeks, Varietyconfirms that the core cast for the upcoming David Fincher film, “The Social Network” (AKA,“The Facebook Movie”) has been set.

Jesse Eisenberg will play Facebook founder Mark Zuckerberg, Justin Timberlake will play Napster co-founder Sean Parker, and Andrew Garfield will play Eduardo Saverin, the Facebook co-founder who had a falling out with Zuckerberg as the social site started to really take off.

Production for the film will start in October in Los Angeles and in Boston. The film, which is penned by Aaron Sorkin, is based on the book “Accidental Billionaires” and is about the creation of Facebook and how its overnight success impacted and changed its creators.

Although the idea of a Facebook movie was indeed laughable at the beginning, the solid crew (and now cast) might just make this a film worth watching — and discussing on Facebook, of course.

What do you think of the cast and the prospects for the film? Share your thoughts in the comments.