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  1. Jun 11, 2015 · Twitter's outgoing CEO, Dick Costolo, in 2012 ( Lionel Cironneau / AP) June 11, 2015. Oh, but what is to be done with Twitter. On Thursday, in a press release posted to its eponymous social...

  2. Jun 11, 2015 · Mr. Costolo, a wealthy former entrepreneur who has led Twitter for the last five years, had grown tired of second-guessing by Wall Street, with its focus on the social network’s sluggish user...

  3. Jan 19, 2016 · Dick Costolo, who stepped down as chief executive of Twitter last year, plans to build a new fitness-focused start-up and join a venture-capital firm.