Imagine something like Reddit, with groups(subreddits) for programming, US politics, Twilight, whatever. Each group can do auto news aggregation - maybe by cus

Imagine something like Reddit, with groups(subreddits) for programming, US politics, Twilight, whatever. Each group can do auto news aggregation - maybe by customizing what RSS feeds get fed into the group. Each group gets to set a theme. Most important though is that each group gets to set the rules. For example: - who can post to the group ? - who can comment ? - how do you get to join the group ? So for a programming group I want it to be invite only (you apply for membership, the group owner gets an email, and clicks a link to let you in). I also want to allow only members to be able to post links and comments. As group moderator, I can also ban people who break the rules. Another group might let any site member post, and so on. Another may or may not allow profanity, or NSFW posts.