Right? The Internet started really picking up in the early~mid nineties. Twitter opened in 2006. Facebook in 2004. There were actual online communities before that. The idea that social media would be a rampart against the disinformation supposedly inherent to humanely-sized, coherent online communities is the worst take ever. The culprit for polarization is precisely social media, and their method was channelling engagement through algorithms fostering gut reactions and virality (I’m adding forums, chats and mIRC to your examples.)
Heh, neat. Here’s the original University of Alberta announcement. The pictures and the video are shared on Google Drive.