Fame for sale: efficient detection of fake Twitter followers
arxiv.org
arxiv.org
Faking followers to create the impression of social proof / trustworthiness should, of course, be regulated since it's flat out trickery and falsely persuasive.
I don't envy the FTC's job on regulating commerce with issues like fake followers and the chaos ahead in regulating fake reviews, thousands of undisclosed endorsements via podcasts / you tubers / etc