Yeah they did but a lot of accounts are popping up again. They need to do another purge. I keep getting tagged by these random users/having these random accounts try to follow me (I keep mine to only people I know IRL) so that's how I can kinda tell.Ah sorry! I think Instagram purged a lot of fake followers a while back actually so they might be more on top of it than twitter but it's definitely harder to tell with Instagram although what @ZeroDiet's said about the likes versus follower numbers sounds pretty interesting.