Actually, although we all just sort of drifted into this kind of game, it is very interesting how finely this sort of thing has to be judged and managed. Collaborative communal writing is very strange. Sherry Ames was killed off (1) by the too bizarre wrecking of the conventions; and (2) by my overdoing how I wanted it to go. You get sort of wrapped up in your version of things. It has to be open, and inviting, and everyone has to keep it short, and either contribute like a separate piece of a jigsaw puzzle, or building on other people's material to keep it coherent. But you have to give up going into author mode, which is hard for writers (or quasi-writers like me). You get caught up in how the structure ought to go. I am reminded of Thackeray who always hated to end his novels because he wouldn't see his characters again. It is a very strange form/formulaic. Fun when it works.
yours, Peter T.