Do you know of any websites where you can contribute to interactive stories?

The kind of collaborative stories where the reader can decide what happens?
Ex:
*If you would like to see what's in the closet, click here.
*If you would like to continue down the dark hallway, click here.

I would like a site that is fairly active.
I know you can do this on www.writing.com , but the stories there are just a little too bizzare for my liking, and i'm not really interested in starting my own stories.


Hopefully you what I'm talking about.
Thank you.