Twitter co-founder Evan Williams will probably be the biggest winner when Twitter goes public, with his 15% stake likely to make him a billionaire, Douglas MacMillan and Ari Levy write. Other investors, including celebrities such as Richard Branson and Ashton Kutcher, also stand to make big bucks from the stock offering -- but some early employees who left without retaining ownership stakes won't be so lucky. "I call it my billion-dollar MBA, because I got nothing," says Dom Sagolla, one of the network's first employees.

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