I get to help choose a social chat app for an online computer science education conference. We'd want something that's:
* Free (or at least inexpensive)
* Easy for new users
* Accessible
* Can be used by participants in all countries
* Can handle hundreds of people in the same "room"
* Makes it easy for people to go off into (and find) smaller rooms
* Should probably support audio and/or video chat (although we'll already have Zoom)
Suggestions?
