I heart listservs
In the newish world of communication-over-a-distance, there are now a number of synchronous media. But for a number of reasons I prefer the asynchronous. Put a small or large number of people (by way of their electronic mail addresses) in a mailing list - a listserv - and you've got, potentially at least, a community that soon or eventually creates a shared language. For teaching there is nothing better as a supplement to the physical meeting of people in a classroom. Some years ago I was interviewed on this topic. My responses might seem somewhat dated now, but I think the gist is still relevant. Here's a page that outlines the presentations and gives links to the RealVideo files that form this interview.