Twitter CEO Dick Costolo Is Out as Co-Founder Jack Dorsey Takes Over

Struggling leader steps down

Twitter CEO Dick Costolo stepped down today from his leadership post at one of the Web's top companies, where his leadership has been under scrutiny for months. In a dramatic return, co-founder Jack Dorsey, also CEO at payments company Square, is taking over as interim CEO, according to Twitter.

"I am tremendously proud of the Twitter team and all that the team has accomplished together during my six years with the company," Costolo said in a statement today.

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