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FILE - In this March 5, 2015 file photo, then Twitter CEO Dick Costolo, adjusts his glasses as he listens to the speech of France's Culture Minister, Fleur Pellerin, at a news conference on Museum Week at France's Culture Ministry in Paris. Costolo, who is ending his nearly five-year reign as CEO on July 1, on Tuesday, June 16, 2015 told a technology conference he is leaving the company with a line-up of upcoming features designed to make the short-messaging service more profitable and more useful to more people. (AP Photo/Michel Euler, File)

FILE - In this March 5, 2015 file photo, then Twitter CEO Dick Costolo, adjusts his glasses as he listens to the speech of France's Culture Minister, Fleur Pellerin, at a news conference on Museum Week at France's Culture Ministry in Paris. Costolo, who is ending his nearly five-year reign as CEO on July 1, on Tuesday, June 16, 2015 told a technology conference he is leaving the company with a line-up of upcoming features designed to make the short-messaging service more profitable and more useful to more people. (AP Photo/Michel Euler, File)

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