First, I think the most-missed story about the 2016 election is the role that Groups played in Bernie Sander’s ascendance. The volume of meme content and direct voter contact that I received from Bernie volunteers and passive supporters from just a few major pro Bernie groups alone— ones that I was not even part of— exceeds the volume that I have received from all other campaigns online to date.
Second, in the early days of Groups, FB decided I was a very far right-wing activist and recommended that I join a series of groups agitating for a US military coup. I still have screenshots of it. It eventually got better at guessing my tastes.