We're going to start pretty much at the very beginning. Thinking of right after the group meets up with Yuuko for the first time, so it'd be the first world. Sure you can talk about other worlds. =)
The interaction between characters will be though the main community, but you can also use your own journal as well.
I hope that this makes sense. I'm thinking of asking everyone here how they'd prefer to do this roleplay. I'm up for all suggestions.