https://www.theguardian.com/technology/2019/feb/07/twitter-shares-fall-amid-concern-over-falling-user-numbers > Company reports 321 million active monthly users in fourth quarter, a drop of 5 million > Twitter’s share price fell more than 8% in early Wall Street trading as record fourth quarter revenues and the milestone of achieving its first full year of profitability failed to allay investor concerns over a drop in user numbers and a weak revenue forecast.