Twitter CEO Costolo speaks at the TechCrunch Distrupt 2013 technology conference in San Francisco

Reuters
Twitter CEO Costolo speaks at the TechCrunch Distrupt 2013 technology conference in San Francisco
Dick Costolo, Chief Executive Officer of Twitter, speaks on stage during the TechCrunch Disrupt SF 2013 technology conference in San Francisco, California September 9, 2013. REUTERS/Stephen Lam
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