there's "Chatting", and "Posting", seems..
Chatting is generally synchronous, text, voip, audio.. one on one, or in groups
Posting is more asychronous.. reddit, masto, bulletin board systems..
Seems you're simply either chatting or posting.
a recent addtiion is the return of the Multi User Dungeons.. think googledocs, miro boards, or collabora office..
Beyond MUDs, there's LAN games, and MMOs. Oh, and a whole genre of anime about interactions in virtual worlds..
US$0.02++
@mousey I agree these are the current categories. But if we started again from scratch, would we come up with the same ones again with hard boundaries between them?