Four challenges for Twitter’s next CEO

Dick Costolo has stepped down as CEO of Twitter after five years on the job, relinquishing his post amid longstanding problems including sluggish growth and frequent abusive comments posted to the social network.

Twitter CEO to step down

Twitter CEO Dick Costolo has announced that he will be leaving the social networking company on July 1, a move that comes after months of intense pressure from disgruntled investors.

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