You know that collaborative writing website I wanted to make? Well, I should have known that if I waited long enough, someone else would do it.
Ficlets isn’t exactly what I had in mind, but it covers many of the bases. People can not only continue a story or write a prequel to a story, but they can also comment on individual story pieces. Ficlets also does me one better: there can be numerous prequels and sequels to any story anywhere. Multiple “canons”. If you don’t like one sequel, you can write another. And the navigation is really simple–once you’ve grokked it you can follow a story thread easily either way.
If you’re wanting to write a story with a select group of friends, this probably isn’t the solution for you. But if you want to get feedback and inspiration on your writing, Ficlets looks like a great place to play.