Protagonize is an online community originally dedicated to the (nearly) lost art of the addventure (yes, that's spelled right), a very specific type of collaborative fiction. Recently, the site has been expanded to support the creation of linear stories, as well. We hope this will allow the site to attract a broader community of authors looking to create collaborative, interactive fiction.
An addventure is a type of online interactive fiction that combines aspects of round-robin stories and Choose Your Own Adventure-style tales. Like a round-robin story, an addventure is a form of collaborative fiction in which many authors contribute to a story, each writing discrete segments. However, like a gamebook, the resulting narrative is non-linear, allowing authors to branch out in different directions after each segment of the story. The result is a continually growing work of hypertext fiction.