Despite beating expectations on both the top and bottom line in its fourth quarter earnings report on Thursday morning, Twitter’s share price fell nearly 10 percent during the day. The reason for the harsh market reaction was the same old problem that the company has been having for years now: disappointing (or in this case non-existent) user growth. Twitter’s monthly active user base shrank by 9 million users in the fourth quarter compared to Q4 2017, marking the third consecutive quarter of negative growth for President Trump’s digital megaphone.