Does the adage “two heads are better than one” apply to fiction writing? Protagonize seems to think so. The site is an online forum for collaborative fiction, where members can add new paragraphs to a linear story or create alternative endings or branches to an existing story. Even better, the stories can be tied to an RSS feed, so you’ll always be up-to-date on the newest fictional twist and turns. Protagonize popularizes a type of literature they refer to as “addventure,” an update on the “Choose your own Adventure” stories from the 1970s in which authors can choose (and create) alternative scenarios to build a personalized, unique story.