Enlarge (credit: Chesnot | Getty Images) In the wake of the 2016 election, Facebook knew it had a problem. Pages and fake accounts created by the Kremlin-backed Internet Research Agency had spread through the social network and drawn massive engagement from real users. Facebook knew it had to get things under control. But years later, Facebook’s own internal research teams revealed that troll farms were still reaching massive audiences, even if they didn’t have large direct followings.