The evolution of Twitter over the last two years has been the opposite of what most expected before the startup went public. Instead of growing to a billion users without much money to show for it, the company’s user growth has stalled out while its revenue has boomed. Its inability to keep pace with the size of rivals like Facebook and even Instagram has spurred rumors that CEO Dick Costolo will be forced out. To keep employees calm, Twitter executives have reportedly restricted access to crucial statistics, like the number of monthly active users. Oh, and its inability to deal with rampant abuse on the platform is causing core users to abandon ship.