https://www.cnet.com/news/facebook-will-ban-false-voting-information-during-midterm-elections-report-says/

The social network has been scrutinized for not taking more action against fake news and misinformation, including interference by Russian trolls during the 2016 US presidential election. Facebook has said it'd rather demote posts with misinformation than ban the source. 

"We don't believe we should remove things from Facebook that are shared by authentic people if they don't violate those community standards, even if they are false," Tessa Lyons, product manager for Facebook's News Feed, told Reuters.