> - Discord. A little over half said they use it routinely. I should have asked more about this.

People have been using Discord to host chats for student societies, classes, to complete group work, and other school related messaging threads (seems to replace school subreddits).

There are some school provided class chat boards from things like Blackboard, but those are monitored by the instructors and TAs. The discussions tend to be more open and frank in Discord.