Jesse Eisenberg

as Mark Zuckerberg

Andrew Garfield

as Eduardo Saverin

Armie Hammer

as Cameron Winklevoss / Tyler Winklevoss

Justin Timberlake

as Sean Parker

Rooney Mara

as Erica Albright

Max Minghella

as Divya Narendra

Brenda Song

as Christy Ling

Josh Pence

as Tyler Winklevoss (Body Double)