Informal communities to Formal

Ok another question

How do informal communities promote themselves to permanent, formal communities? This needs to be easy. But so does forming an informal community in the first place.

I think the easiest way to make this happen is to have a registration station in the main base.  I think that people will naturally wish to group according to play styles, real life relationships, and whoever is available to play at the same time that they are playing.  As such there will need to be a looking for group channel and board for pick up groups and missions.  This board will need to include rally location (gathering point), as well as goal, and approximate time frame.  I know that friendships can be spontaneous and I would hope that players do not feel confined to playing only with the other members of their squad, or platoon, or all the way to the highest echelon, which they should both be a part of anyway.  This is something that will naturally occur anyway.