I'm part of a community that limits how much you can post and (up)vote in a day. The points for these actions are shared. There is no down-vote. There are two

I'm part of a community that limits how much you can post and (up)vote in a day. The points for these actions are shared. There is no down-vote. There are two kinds of users, regular ones and "elders" of sorts. First few were established years ago and they can vote on others to become "higher tier" users as well. How much votes you need depends of how many people can vote. The registration is not automatic, but you fill out a form with an open-ended question and selected users (mentioned above) can vote to approve the registration. The system has threaded discussions where every post is equal. So you create a post and it can become a new "topic" (or forum, or however you want to call it). These can be nested of course. Whether something is a comment, topic, list of topics, blog, ... depends entirely on the template used to view that entry. You can manage privileges (rwx) to these subtrees (or any single node in the tree).