Such 'central hubs' /forums have been in existence for years....as have Miata clubs.
miata.net, miataturbo.net, clubroadster.net and others, all have a heavy
amount of Atlanta traffic. There are numerous gatherings of Miata owners
that take place around Atlanta at any given time, in all different age and interests. This area is/was the home of RSpeed, Downing, Mazmart etc etc all players in the Miata world since the beginning. Some of the first forced induction Miatas were done right here in the area.

Of course, if youre starting a club/forum for broke ass teenage ricer Miata owners that might be different.

But hey, good luck. The more the merrier. I'll stop by.