https://www.cnbc.com/2018/07/13/jack-dorsey-loses-200000-followers-on-twitter-after-fake-user-purge.html

Twitter CEO Jack Dorsey lost 200,000 followers on his own social network after a purge of fake followers.

Twitter has been deleting so-called “locked accounts” as part of an initiative to cleanse the platform of bots. These are profiles that Twitter locks if they exhibit suspicious behavior like tweeting a large amount of unsolicited replies or mentioning users en masse.