protagonize: interactive fiction & collaborative story writing community

Welcome to Protagonize: your destiny awaits.

Protagonize is a creative writing community dedicated to the (nearly) lost art of the\naddventure, a type of collaborative\ninteractive fiction. One author writes a story, and others post branches to it in different directions. The result is\nan organic, evolving story where everyone can participate

via EFL Geek

We had something like this on the computer system where I went to college–I think either written by, or just mostly populated by, folks in the Science Fiction Club.  The fiction that resulted was god-awful.  Some of that may have been the form, some of that may have been the folks (hard to expect much coherence from a club with the motto “Randomness Rules!”), but it was a way to while away time, and sometimes was pretty funny.