Live Journal as an interactive narrative tool

Thoughts on the Live Journal interactive narrative idea:

1. I don’t want to do “the story game” (where each person writes a piece of the story).
2. I don’t want to do a simple novel serialization like Class of 91 or a “writing in public” exercise like Listener by Ellis or Unwirer by Cory Doctorow and Charlie Stross. But, I wouldn’t rule out the idea of doing a project using Movable Type, a wiki, or some other collaboration ware. (Brenden, you game?)
3. I’m thinking of trying to work with non-fiction (to be true to the journaling purpose of the community). But I don’t want to duplicate the Fray or City Stories and the like.
4. I want to find some way to integrate filters, social network features, commenting and so on.
5. Perhaps a sort of non-fiction role-playing game? Or a game with “assignments” to be carried out in real life, and then reported on in the journal?