I'm certainly not requesting for all posts/forums to be private, but I'm wondering if it would be a good idea to allow the functionality. By private, I mean you have to be logged in to see it (and it also won't be indexed by search engines).
Also, the ability to make a forum only visible to users upon invitation would be cool (i.e. for a private book club, writer's group, or such).
One plus to private forums for Nabble specifically is that mailing lists might not complain about being on Nabble as much if people had to log in, or be invited.
Don't get me wrong, I love public forums. I'm mostly suggesting this because it could be useful at times for some people (including me once in a while, though I mostly prefer the public sort).
A private book club is something I want to do, though. This could also be good for something like a family forum (just for the family/relatives).
To make it easy on people, though, I highly recommend the ability for users to request entrance into private forums (that way the creator doesn't have to keep track of who all they've invited and such).
