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Dick Costolo on What's Working at Twitter and What Isn't

New CEO Talked to Ad Age Editor Abbey Klaassen Before Taking Reins of the Micro-blogging Service

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NEW YORK (AdAge.com) -- Ad Age editor Abbey Klaassen sat down with new Twitter CEO Dick Costolo during the IAB's Mixx Conference at Advertising Week to talk about what's working, what isn't and what's ahead for the fast-growing micro-blog service.

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