I was searching Google today and found this post https://forum.upcase.com/t/how-to-free-up-swap-space-heroku/3017 and was able to view it without logging in. Usually when I’ve join paid forums in the past, they’ve always been private, so this surprised me and I wasn’t sure if was that way because someone didn’t flip a switch or it was intentional.
It seems like it can be:
Do you mean the entire forum is private? That is supported in two settings:
password on site
moderator must approve all users
There are of course PMs and group PMs already built in.
If you mean only certain categories are private, that’s not implemented yet.
Source: Jeff Atwood reply