In short, one user makes a story and at least one user plays it. The story is in a world and presents challenges, the players decide how to respond and can play some cards defining their strength sand weaknesses. That is, the storyteller does not have complete control of the story, perhaps just the direction. More information can be seen on the How to play page.
I pledged the $10 for the beta access to check out what it is, and i am thinking of becoming a member. The only benefit of member is that the first year is $20 instead of the expected $25. Truthfully, the $5 saved doesn't justify the gamble, but i am enjoying the game.
As of right now, the Kickstarter project has only 12 hours left. Doe this form of storytelling interest you?
Update: Changed "at least two users play it" to "at least one user plays it".
Changed "i just saw the homepage, " to "i just saw makeuseof's homepage"