Theoretically, the main point here is that Facebook has an independent fact checker program, and some of those fact checkers rated Russian media posts (which would lead to a big scary overlay and a reduction in views) I'd guess they would have used some other excuse to block Facebook sooner than later anyways though.
"independent", are you really able to say it with straight face? I'm not even talking of russian posts, it is as partisan as can be, supporting Dem agenda and suppressing GOP.
Interestingly, if you read the Mueller report you will see that Russia generated fake news for Democrats as well (it just didn't spread as well as on its own).