I suggest that we allow invite-only communities. They would not be private, but read-only to those who haven’t been invited yet.
The purpose of it would be to allow administrators and moderators to guide the growth of their communities, to help them grow organically, in a controlled fashion, so as to gather like-minded people who make high-quality contributions to their communities. Once a community has become large and stable enough, its administrator may make it open for anyone to participate in it.
What do you think?