It looks like most of the election stuff was normal humans reposting things of their own volition. Yeah, there were lots of lies in it, some of it was actual fake newspapers being run out of Macedonia or whatever, but are we making facebook a scapegoat just for being the medium? Before 2016, I never heard anyone saying FB had an obligation to fact-check political speech..
Maybe we, as a society, need to figure out how to handle social media rather than expecting a guy like Zuck to do it for us.