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Ask a Silly Question.

These entrepreneurs didn't just get a good answer--they started a phenomenon.

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This story appears in the September 2007 issue of Entrepreneur. Subscribe »

"What are you doing?" By asking this trivial question, has gotten people talking. "The first thing people usually say is, 'Twitter seems like a completely useless service,'" admits 30-year-old , who, with Evan Williams, 36, and , 33, started the mobile social network in March 2006 so people could ask their friends that question. While some just don't get it, others can't get enough: The number of users and updates doubles every two weeks.

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