Since nobody else has mentioned it, for some years, after having been birthed as a backchannel during ICANN Meetings, the At-Large Community on Skype (128 participants, admin:Evan Leibovitch) has functioned as pretty much the default chat channel for At-Large worldwide. It is browseable, but not searchable AFAIK, I doubt anybody ever bothers. Skype chat also is very flexible when it comes to forming ad hoc groups.
Question. Does a chat channel work better for free discussion than email? It may be subjective, but it seems the flow of conversation from chat to more formal minuted calls works well. Outcomes are then recorded on the wiki.
Lastly, I will say that, in ISOC, while we hook up in a variety of manners, we pretty much exclusively now use Zoom for calls.
j

