Ali Rowghani, Twitter's (TWTR -1.1%) COO since Dec. 2012 and before that its CFO, has resigned from his position, but will "continue to be a Twitter employee and act as a strategic advisor to the CEO." (8-K)
The company doesn't expect to name a replacement. Rowghani's responsibilities will be handled by other Twitter execs going forward.
The shakeup comes as Twitter pulls out all the stops to boost slowing user growth/engagement amid worries the microblogging service (255M MAUs) will never have the same kind of mass appeal as Facebook (1.28B MAUs).
Previous: Twitter's engineering chief steps down