One thing I learned about collaborative writing is that it's very hard to make work. Everyone has their own ideas of where the story is going, everyone is at a different level of skill and understanding, and everyone has their own idea of the climax they are working towards. But this is also what makes it really fun. There's a few anthology films I've seen (Four Rooms, New York Stories, Paris, je t'aime ) that tell stories with multiple directors, this reminded me of those films.

In the future, it seems like the original poster of the story should have a protagonist and antagonist (or a few other supporting characters) backstory set up beforehand, some small paragraph giving us their desires, what they're willing to do to achieve them (the answer is always anything), what they're all about. That, along with a strong beginning that sets up a potential conflict, and I feel it would be much easier for a collaborative effort to go down without it lasting forever with no end in sight. Heck, maybe even have a 'part' limit set from the start--we have to finish this story in ten parts, reserve your spot and let's go!

It's slipping my mind who was doing this, but someone was periodically posting a little 'catch-up' information detailing the story, characters, and where everything was at. That was extremely useful and I believe it'll help future efforts succeed.