A week and a half after Dick Costolo announced that he would be stepping down from the CEO role at Twitter, the company’s board of directors has sent a shot across the bow of one of the expected front-runner candidates to take the social network’s top job.

The social micro-blogging company’s search committee will only consider CEO candidates “who are in a position to make a full-time commitment to Twitter,” the board said.That would seem to rule out Jack Dorsey, the company’s co-founder who currently works as the CEO of Square and will be filling in as interim CEO of Twitter.

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