Facebook's problem is it's trying to be a publisher but without actually producing anything, just stealing other people's content and hosting it on their own website without paying the producers. That and all it cares about it clicks/views so it's clickbait > facts.
Facebook seemingly isn't that great either (as this excellent - but lengthy - article discusses)
https://www.wired.com/story/inside-facebook-mark-zuckerberg-2-years-of-hell/