Twitter CEO Dick Costolo resigns; Jack Dorsey returns in interim role
Big news out of Silicon Valley this afternoon: according to a filing submitted to the SEC, Dick Costolo — the struggling CEO of Twitter — is stepping down, and in his place, at least for the time being, is Jack Dorsey, the former CEO of Twitter and an interesting character himself. Dorsey starts back at the company he co-founded July 1, the New York Times reports.