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CEO Dick Costolo is helping Twitter IPO take flight
CEO Dick Costolo is helping Twitter IPO take flight

SAN FRANCISCO — Dick Costolo doesn't fit the profile of a typical tech start-up chief executive. He's not a twentysomething college dropout. He didn't start Twitter Inc. in his dorm room. And he doesn't wear a hoodie. At 50, with a balding head and square-rimmed glasses, he's a seasoned executive with a substantial corporate track record — much like Eric Schmidt, the "adult supervision" who helped Google Inc. co-founders Larry Page and Sergey Brin turn their search start-up into an Internet moneymaker. Although not a company founder, Costolo was precisely what Twitter needed three years ago when he took the helm of the troubled start-up....