• Mark Zuckerberg (played by Jesse Eisenberg)

    Mark Zuckerberg is Mark Zuckerberg. You know who he is.

  • Cameron and Tyler Winklevoss (played by Armie Hammer)

    Cameron and Tyler Winklevoss, the identical twin Olympic rowers who founded ConnectU - Cameron later cofounded Guest Of A Guest - received a reported $65 million settlement from Facebook in a suit that alleged Zuckerberg had broken an oral contract with them and stolen their idea. The Winklevosses placed sixth in the men’s coxless pairs in the 2008 Beijing Olympics, and they’re currently busy still suing Facebook. They seem nice.

  • Eduardo Saverin (played by Andrew Garfield)

    Eduardo Saverin was one of the co-founders of Facebook and currently owns a 5 percent share in the company. He likes Greek Yogurt and lives in New York. The Internet does not seem to know what he’s currently doing for a living.

  • Divya Narenda (played by Max Minghella)

    Divya Narenda (the third partner in ConnectU) went on to cofound SumZero, a social network for investors working at hedge funds. Based on my extensive research into SumZero during the last 25 seconds, it does not seem like it is a whole lot of fun.

  • Sean Parker (played by Justin Timberlake)

    First of all, who knew that Sean Parker was so involved in the beginnings of Facebook? Did you guys know that? I totally missed that.

  • In case you missed that era, Parker got famous and made the RIAA really grumpy and litigious in the process by creating Napster. He went on to found Plaxo, an online rolodex to help people keep track of changing contact info in their networks. It was acquired by Comcast in 2008 for $150 million.

  • In 2007, Parker also cofounded Causes - a Facebook platform that helps people donate to their favorite nonprofits and which currently has 90 million users. Parker was pushed out of his position as Facebook President in 2006 after being arrested for cocaine possession, although charges were never filed. You should totally read this Vanity Fair profile of him.

  • Dustin Moskovitz (played by Joseph Mazzello)

    Dustin Moskovitz, who shared a room with the other Facebook cofounders (Zuckerberg, Chris Hughes, and Eduardo Saverin) at Harvard continued to work at Facebook as Vice President in charge of the technical staff until 2008.

  • He has since raised a $9 million series A round of funding from investors (including Peter Thiel and Sean Parker) for his startup Asana, which - apparently? - will create “collaborative task and project management software.” So they can jump right into the gaping hole that Google Wave left behind after that project drowned in a tidal wave of public indifference.

  • Chris Hughes (played by Patrick Mapel)

    Facebook cofounder and Zuckerberg roomie number 2 Chris Hughes left Faceook to manage online organizing of Barack Obama’s social networking efforts during the 2008 campaign. In hindsight, that actually went really well, so nice job, Chris Hughes.

  • He’s currently executive Director of Jumo, a startup that connects philanthropists and donors to charitable causes.

  • Peter Thiel (played by Wallace Langham)

    Peter Thiel is a venture capitalist (he’s the managing partner of the Founders Fund) who provided the initial investment for Facebook. He invented PayPal.

  • Erica Albright (played by Rooney Mara)

    Erica Albright probably doesn’t exist DOES exist, in a roundabout kind of way: those LiveJournal entries were actually (apparently) about someone called Jessica Alona. After all, it’s not entirely unlikely that Mark Zuckerberg had a real live actual girlfriend before meeting his current ladyfriend (and probably future wife, if the recent New Yorker profile on him is to be believed) Priscilla Chan in college.

  • Either way, Rooney Mara’s very pretty! She will be playing Lisbeth Salander in the upcoming Dragon Tattoo movie, also based around the concept of a computer nerd who pisses everyone off.