Bloomberg: Twitter’s board is said to be considering a shakeup that may involve the departure of former CEO Dick Costolo. The changes, which could be announced when the company names a permanent CEO, are aimed at making the group of directors more diverse. The board may expand or be shuffled to include directors from different backgrounds, such as minorities and those with experience in adjacent industries, including advertising and e-commerce. Any changes may also address the fact that the current board includes three former CEOs — Jack Dorsey, Ev Williams and Costolo — an issue that would make it difficult for any new CEO to run the company.