Working on "Grow a Story". It's based on the old drill/game "advance and expand" where someone starts a story and hands it off to someone else. As a user, you have three actions: start a new story, expand an existing story, or refine.

Refine is the most interesting part, you are essentially editing the transition between two story nodes. The goal is to not add much, but make the transition smoother. Was thinking of capping the allowed delta in some way and requiring the original authors to approve the story "PR".