So basically, the game leans more heavily on improv than most. In addition to everyone building the world together, players can spend metacurrency (Fabula Points) to do things like, say "there's someone I know who lives in this town and might help us," or "wouldn't it be cool if this mysterious figure we were just introduced to was secretly Frank's character's long-lost wife?" If it affects another player's character, like that second example, the player has to agree. If nothing that's already been established contradicts the idea, it gets added to the plot.

My players don't really use this facet very often, but it has the potential to be really neat, if also to make the DM throw out some notes at times.