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Of course if you know what IRC is you could use a client like irssi, kvirc or mirc.
I think that the chat might help increasing the userbase's activity.
https://en.wikipedia.org/wiki/Internet_Relay_Chat if you're not familiar with the concept.
This would allow us to chat in real time - I wonder though, if there is a large enough userbase to have any degree of activity. In any case, IRC is a good way to have group instant messaging.