What do you mean by that? Filtering billions of posts, trying to figure out which ones are "real news" vs. "fake news," and which ones come from well-meaning vs. nefarious actors, AND doing so in a way that is not only politically neutral but also perceived as politically neutral is a MASSIVELY non-trivial problem.

Even if you think the social networks should be trying to solve this problem (and some would argue that it's a hornets nest they would do well to avoid), acting as if they're being negligent or incompetent because they haven't figured it out already is a bit unfair.