15% accounts on twitter are fake, sold by companies. And, apparently, many celebrities, politicians, actually buy them. Also, twitter of course knew, but don't really do anything about it.
here's New York Times articles.
〔 The Folowwer Factory 2018-01-27 By Nicholas Confessore, Gabriel J.X Dance, Richard Harris And Mark Hansen. At https://www.nytimes.com/interactive/2018/01/27/technology/social-media-bots.html 〕
(New York Times is often sjw fake news. This seems a good one.)