I found this "Multiverse" thing randomly looking for something somewhat unrelated, but since it might be just what I needed for a little thing that's been on my head for a while... Here I am.
So far I haven't had time to try and start the server, but seeing that the demo server might be up again sometime I'll check it out once it's on.
One thing that bugs me is that I can't seem to find a way to know what year posts were made though.