Author David Kirkpatrick traces the story of the most powerful social networking tool of our day from its humble beginnings to its role as an international phenomenon. He is in conversation with TechCrunch's Michael Arrington.The Facebook Effect is the only book written with the full cooperation of Facebook founder Mark Zuckerberg. Started only six years ago, Facebook can now claim more than 400 million users and a potential valuation of $100 billion by 2015.Is an IPO forthcoming?

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