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Costolo hopes to break into the crowded field of fitness tech. He's also joining a venture capital firm.
Costolo will reportedly relinquish his seat on the board of directors once a new full-time CEO is found, or by year's end.
Twitter CEO Dick Costolo is out after months of disappointing investors. Twitter co-founder Jack Dorsey becomes interim CEO on July 1.
Twitter CEO Dick Costolo says he's not worried as questions resurface about his job after company's disappointing first-quarter earnings.
The microblogging service's chief is taking personal responsibility for the platform's slow response to user abuse and harassment, according to memos obtained by The Verge.
The company will work with 40 organizations to figure out ways to combat the harassment that plagues the Twittersphere.
Sure, you could just talk to the person sitting next to you at the party. But why limit yourself? From Bill Simmons to Shannon Sharpe, these folks will keep you entertained, even if the game doesn't.
CEO Jack Dorsey takes to Twitter -- where else? -- to bid farewell to four department heads as he attempts to turn the company around.
Despite Twitter’s stock plummet, CEO Dick Costolo’s job seems safe -- for now. But he needs to explain his strategy better.
One of Twitter's co-founders has come back to help the troubled social-networking company. Seen as part artist, part visionary, the question facing Dorsey now is whether he can turn the company around.