What is "neutral"? Neutral as in halfway between political extremes, even if that does a disservice to the truth? Or neutral as in only reporting fact-checked stories, even if they're incredibly biased to one side?

There is obviously false, and then there is everything else. I guess the best facebook can do is weed out the obviously false. If they do that, it is a guarantee that they will get attacked for being biased, because with the shifting of the political winds usually one party or the other spreads more misinformation.