NEW YORK (Fortune) -- Best-selling author Ben Mezrich is the first to concede he doesn't know exactly what happened between Mark Zuckerberg and the Victoria's Secret model at that San Francisco club in the summer of 2005. He tells the story just as sources reported it to him: a touch on the leg. A grasp of the hand. The pair leaving the club. That's it. Any inference from there is your own.
But man, is there ever inference. In "Accidental Billionaires: The Founding of Facebook: A Tale of Sex, Money, Genius and Betrayal," due out July 14 from Doubleday, Mezrich spins a fast-paced tale of intrigue and suspicion that follows Facebook's young founder on his ruthless rise to prominence in Silicon Valley. The 262-page narrative portrays Mark Zuckerberg as a hard-hearted genius with a fetish for Asian women who is not above stealing ideas and turning on his friends in his quest to create the dominant social network. "West Wing" creator Aaron Sorkin has already agreed to write the screenplay, and Daily Variety recently reported that David Fincher ("Fight Club") may direct the movie.
Mezrich, who was criticized for making up characters and scenes in his best-selling book "Bringing Down the House," uses a lengthy author's note to broadcast his reporting methodology. He describes his work as a "dramatic narrative account," explaining that he reconstructed dialogue and even, to the extent that it moved the story forward, entire scenes. Some would call this fiction. But Doubleday has bravely labeled it nonfiction. Or as Mezrich told Fortune.com, "There are certain places in the book where I'm sort of doing a legitimate speculation." He calls his work "a best guess."
Of course, Mezrich's primary source for a good deal of the material is Eduardo Saverin, a classmate at Harvard College of Facebook founder Mark Zuckerberg. Saverin used earnings from smart investments he'd made as an undergraduate to help start the site, then called TheFacebook.com.
Long before Saverin connected with Mezrich, however, he'd become estranged from Zuckerberg. After Saverin was pushed out of the company, Saverin and Zuckerberg lobbed lawsuits at each other liberally from April 2005 until last August when the suits were dismissed. Over the winter Saverin's name was added to the Facebook web site as one of the cofounders. At about that time Saverin also stopped talking to Mezrich. Saverin didn't respond to Fortune.com's attempts to contact him.
Mezrich remembers meeting Saverin by chance. "It was about 2 a.m. in the morning when I got an email out of the blue to my web site, which is essentially a fan site. This kid wrote an email -- I'm a Harvard senior and I have a really fantastic story for you' -- which of course you hear all the time. But the kid said, 'You know, I've been best friends with these people who founded Facebook, and I want to tell you this story.' I wasn't looking for this story, but I went and met this kid for a drink. So I show up at this bar, Bar 10 at the Westin [hotel in Boston], and the kid shows up with Eduardo Saverin. He wouldn't tell me who Eduardo was at first. It was all kind of secretive. Then Eduardo began to tell me this whole story, and he was clearly upset."
Mezrich is quick to add that "Accidental Billionaires" is based on many other interviews and documents. He got lucky, of course, when thousands of pages of court documentation surfaced after Cameron and Tyler Winklevoss, also former classmates of the Facebook founder, sued Zuckerberg claiming he stole their idea. (This suit settled and the twins reportedly received $65 million.)
One person Mezrich never spoke with is Mark Zuckerberg. Says Mezrich, "There was always this 'Mark might talk to you, Mark might talk to you' thing going on, but in the end Mark decided not to talk to me, and he made it pretty clear he didn't want any of the people he's involved with talking to me." In a deft story-telling move, Mezrich turned this deficit in his favor, playing up the mystery behind Zuckerberg's personality.
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