Mark Zuckerberg
Erica Albright
Billy Olson
Phoenix Club President
Dustin Moskovitz
Chris Hughes
Eduardo Saverin
Phoenix Member Playing Facemash
Girl at Phoenix Club
Student Playing Facemash
Erica's Roommate
B.U. Guy in Bra
Mr. Cox
Mrs. Cox
Student in Communications Office
Gretchen
Sy
Marylin Delpy
Court Reporter
Henry
Cameron Winklevoss / Tyler Winklevoss
Tyler Winklevoss
Divya Narendra
Gage
Ad Board Chairwoman
CS Lab Professor
Phoenix Club Hazer
Phoenix Club Pledge
A Capella Group
A Capella Group (as Richard Ferris)
A Capella Group (as Anh Nguyen)
Model (as Inbal Annabelle Amirav)
KC's Friend
KC
Speaker / Bill Gates
Christy
Alice (as Malese Jow)
Stuart Singer
Vikram
Bob
Reggie
Sean Parker
Amelia Ritter
Larry Summers' Secretary
Larry Summers
Anne
Ad Executive
Tori
Intern Eric
Intern Ian
Sharon
Andrew
Victoria's Secret Model
Beautiful Woman
Harvard Rowers' Coxman
Harvard Rower
Hollandia Rowers' Coxman
Hollandia Rower
Hollandia Rower (as Dave Lambourne)
Prince Albert
Prince Albert's Aide
Howard Winklevoss
Mr. Kenwright
Stoned Girl (as Sarah Shane Adler)
Stoned Girl
Bank Teller
Peter Thiel's Assistant
Peter Thiel
Maurice
Facebook Lawyer
Mackey
Ashleigh
Sorority Girl
Sorority Girl (as Cherilyn Rae Wilson)
Fraternity Guy (as Caleb Jones)
Policeman
Final Club Girl #3 (as Naina Michaud)
Student (uncredited)
Student Playing Facemash (uncredited)
Dancer (uncredited)
Bob (uncredited)
Harvard Student (uncredited)
Phoenix Club Member (uncredited)
Melanie (uncredited)
Final Club Girl (uncredited)
Diner Patron (uncredited)
Dorm Room Guy #3 (uncredited)
Party Girl (uncredited)
Pheonix Club Hazee (uncredited)
Gogo Dancer (uncredited)
B.U. Guy in Bra #2 (uncredited)
Mr. Edwards (uncredited)
Waiter (uncredited)
Luther (uncredited)
Regatta Spectator (uncredited)
Pedestrian (uncredited)
MIT Student (uncredited)
Popular Harvard Student (uncredited)
Sorority Girl (uncredited)
College Student (uncredited)
Hacker (uncredited)
Hacker Shot Girl (uncredited)
Party Guest (uncredited)
Rob (uncredited)
Party goer (uncredited)
Pub Patron / Passerby (uncredited)
Bar Patron / Pedestrian (uncredited)
Harvard Note-Passer (uncredited)
Romantic Boyfriend (uncredited)
Facebook Employee (uncredited)
Go-Go Dancer (uncredited)
Bobby's Friend (uncredited)
Videographer (uncredited)
Art History Professor (uncredited)
Fraternity Party Attendee (uncredited)
Resident Dean (uncredited)
Bouncer (uncredited)
Gretchen's Associate (uncredited)
Romantic Girlfriend (uncredited)
Phoenix Poker Guy (uncredited)
Club Waitress (uncredited)
Dorm Room Guy #2 (uncredited)
Ruby Skye Waitress (uncredited)
Club 66 Girl (uncredited)
Hazing Student (uncredited)
Code-Writer (uncredited)
Jewish Harvard Student (uncredited)
College Student #2 (uncredited)
Computer Nerd (uncredited)
Club-Goer (uncredited)
Model (uncredited)
Dutch Rower (uncredited)