Every centralized "open to everyone" social media platform, yes. No "trends" on Mastodon though, so you don't have to worry about this BS on there, and blocking instances that allow bots/spam is easy. :)
Here are just a couple:
https://www.theguardian.com/technology/2017/jun/19/social-me...
https://internetofbusiness.com/propaganda-bots-social-media-...
https://www.snopes.com/news/2020/06/24/how-fake-accounts-con...
https://www.forbes.com/sites/forbesbusinesscouncil/2020/08/0...