The big fancy scholarly term for what happens in OnlineCommunities. -- MikePence
CMC also refers to a lot of communication in networks/systems that are not (nor intended to be) communities.
Another common term is GroupWare
Goddammit, this sounds like the Wiki:PatternLanguageForTextualElectronicCommunications. A phrase that went to college. Sure enough, they were just trying to publish more Patterns papers instead of trying to do something useful.
I've started a page on my wiki for analyzing CMC modes of operation: [UseTheWholeSpectrum].