I’ve made the case previously for how stories can play a role in your efforts to bring about social change or individual behavior change. One of the best ways to draw people into your story is to provide opportunities for them to participate — whether they can contribute to building a rich storyworld, or actually have a role in the direction of the narrative. When someone feels like they are part of the story unfolding around them, they can vicariously experience what is happening to the characters. This type of immersion done well can evoke empathy, get an individual to think about how they would respond if they were in a particular situation, and/or frame their conception of how the world should work.
Collaborative storytelling is an experience in which multiple people contribute to the course of a narrative. There are many forms this could take – an exquisite corpse project, in which one person picks up the story where the last person left off; LARPs (Live Action Role Playing) and other role playing games like Dungeons & Dragons; interactive stories where the audience can vote on what action the characters should take next; and shared storyworlds, in which parallel or intertwined story-related content may be created collaboratively by a group of people.