I'm intersted in starting stories and having someone else pick up where I've left off... or picking up a story where someone else left off.. I know this is a thing, but I don't know what it's called.

Imagine that I start a story and call what I've written chapter 1. 3 people write a chapter 2. 1 person picks up 1 of the versions of those chapter 2s to write a chapter 3, but 5 people pickup a different t version of chapter 2. Maybe no one likes that other chapter 2, so it dies.