Twitter: Dorsey Interim CEO; Wall Street Responds

Meet the new boss. Same as the old boss.
On Thursday, Twitter shocked the world — or at least the relatively small portion of the world that cares about what happens at Twitter — by announcing cofounder Jack Dorsey would take over as interim CEO, replacing Dick Costolo, who is widely liked inside the company, but widely criticized outside of it for the company's lackluster growth and execution.