@AmyPetty@historians.social @freakazoid I think a lot of folks don't realize just how much especially Facebook has affected the way that we all see social media today.
Despite not being the first of its kind, they almost single-handedly redefined what "social media" means; not just that, they were also the origin of the mass belief that requiring "real names" reduces abuse (and, conversely, that anonymity breeds abuse).
They were not the first to *make* this claim (notably, at least a webcomic beat them to that), but they certainly were the ones who popularized the belief, and who the modern beliefs around this topic can all be traced back to.
And yet most people think of this as "something that everyone knows and has always been true". Even though it's false, and is a very recent mass belief.