I'm willing to bet that the vast majority of these shares were by people who wanted the news to be true anyway. I have friends who shared some stuff like that. they were never gonna change their vote/view. everyone else would just roll their eyes.
I'm with Zuckerberg on this one. fake news did not affect the election. people are just looking for an excuse to blame. I would love to see how many people will still be against fake news come April first