Some would perhaps end up in spam, but if you're receiving the "same" message from multiple people, the information itself would eventually came through.
What makes you think this was "in the name of 'fake news'"? It's entirely possible -- and, in fact, much more likely -- that the posts were reported as spam, violent, pornographic, or otherwise abusive. Unless you're arguing that Facebook should throw up their hands and let any content at all on their web site?
I will add that I think it isn't even in their right. "Private enterprise" or not, you still need to abide by rules, and just as a newspaper has to follow certain laws of press (and being a private company does not excuse them nor give them the right to do as they please), so does facebook, as the controller of a great deal of information, have to follow laws of neutrality and anti-censorship.