I thought about a social media concept called "scene" where people are initially randomly matched based on common interests, but then the group is closed to new

I thought about a social media concept called "scene" where people are initially randomly matched based on common interests, but then the group is closed to new contributors at a certain population count. The idea would be to simulate groups that form based on geographic proximity (local scenes and clubs) without the same distance constraint, because for me those local groups have always been more meaningful than online forums, with a few exceptions mostly tied to local groups. The group population cap would limit the number of noobs in healthy scenes.