The day after the New Hampshire primary last month, Facebook’s security team removed a network of fake accounts that originated in Iran, which had posted divisive partisan messages about the U.S. election inside private Facebook groups.
Hours later, the social network learned the campaign of Michael R. Bloomberg, the billionaire former New York mayor, had sidestepped its political ad process by directly paying Instagram meme accounts to post in support of his presidential bid.
https://www.nytimes.com/2020/03/29/technology/facebook-google-twitter-november-election.html