Charlie Warzel: What keeps Facebook’s election security chief up at night?

Facebook is not the entire internet. But it does reflect and account for some of the greater web’s chaos. With just days to go, hyperpartisan pages on the platform are churning out propaganda to millions of followers.In recent weeks, malicious actors both foreign and domestic have attempted to use inauthentic networks to push narratives to sow confusion and division. Others, including President Trump and his campaign, have used the platform to spread false information about voting while so