In essence they already are via the news feed algorithm. It doesn't show you everything all of your friends / pages post, so it's already deciding "what's good

In essence they already are via the news feed algorithm. It doesn't show you everything all of your friends / pages post, so it's already deciding "what's good for you". I think until recently the algorithm making the decision has had a peculiar bias. It's had a bias for "engagement" and the most engaging content is often the most outrageous / incendiary / clickbaity. So if Facebook doesn't "choose what's good for you", a default decision was already made: they'll show you what's engaging. But I think it's important to appreciate that default is still biased. It's just biased in a strange way that could have negative political consequences.