9. The Winklevoss twins were both played by actor Armie Hammer. However, Ralph Lauren model Josh Pence played one of them strictly from the neck down. His face was digitally replaced with Hammer's to make them appear identical, as the two men are unrelated and look nothing alike. The two spent 10 months in twin boot camp to match one another's subtle movements and rapport.
10. Bill Gates is portrayed by Steve Sires, a "professional Gates impersonator," but his voice was dubbed by a "24-year-old African American kid with dreadlocks," who just happened to sound like Gates.
11. Jesse Eisenberg and Andrew Garfield became good friends during filming. According to Eisenberg, the dramatic rivalry between their characters was hard for the two because it affected them emotionally.
12. Justin Timberlake was the only actor who met his real-life character (Sean Parker) before the founding of Facebook and this film. Armie Hammer and Josh Pence met their real-life characters, the Winklevoss twins after filming. The twins enjoyed Hammer and Pence's performance so much they attended a couple screenings of the film.
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