Discussion Board and Groups

I am not sure if this idea has been implemented or not, but I have been unable to find anything like this.

I'm wondering if it is possible to add groups that users can join and create. These groups could contain a discussion board and a list of stories written by members of the group would be shown as well (or perhaps members could add their stories to a group manually and group owners would be able to approve/reject stories). This way people who, for example, write fantasy stories, could join a group for fantasy writers, etc.

I would also love to see some kind of message board (though perhaps the groups feature may be enough), so authors have another way to communicate with each other.