https://www.cnet.com/news/facebook-instagram-sue-china-based-firms-over-sales-of-fake-accounts/

"By filing the lawsuit, we hope to reinforce that this kind of fraudulent activity is not tolerated – and that we'll act forcefully to protect the integrity of our platform," said Paul Grewal, Facebook's vice president and deputy general counsel of litigation in a blog post on Friday. 

Facebook didn't name the companies or people it's suing, but said they also promoted fake accounts on Apple, Amazon, Google, LinkedIn and Twitter as well.