jfyi u can create friendlists on Facebook. So u can have one list just for unicyclists and another for ur local normal friends. Depending on which list u r selecting ur newsfeed will only show statusupdates of listed people.
Anyway, i gotta agree with John. Could be difficult to establish such a platform. But who knows…
Thats exactly how we do it in the German Forum. A lot of Citys have their own threads
e.g. Outdoor-Termine Berlin
thats where we discuss all of our meetings and if someone from out of town is coming he just answers in this particular Berlin-thread.
BBoy.org Forum has its own Sub-Forum just for that http://www.bboy.org/forums/hook-up/