Twitter is estimated to have 48 million bots. Did you read about the Ashley Madison data breach from 2015? 12,000 of the 5.5 million registered female accounts were used on a regular basis, about 0.2%. "The women's accounts show so little activity that they might as well not be there." "we have absolutely no data recording human activity at all in the Ashley Madison database dump from Impact Team. All we can see is when fake humans contacted real ones."