If FB was losing revenue (through boycott or regulation) because it was allowing rampant fake news, the easiest thing it could do would be to hire a pool of people with Wikipedia experience.

The funny thing is that since it was decided that social media platforms would have the role of fighting misinformation, millions of people have left these platforms for alternatives that do not restrict free speech. Telegram, Parler, Mastodon, Gab, Lemmy of course, all created very recently.

Do you have a better solution?

You assume I care about Facebook's revenues. I am not offering them a solution because I hope Facebook is shut down forever. You are asking a wolf how best to protect sheep. In which case, yes hire wikipedia editors to "fact check".