Looks like its just a port of Inform to a web interface: same two-part backstage/frontstage formatting of the screen, same language engine running it. The difference, which is pretty awesome, seems to be that you can post your stories to their site so others can read and comment on them. (If I'm reading it correctly.)
Awesome. Think I'll play this with my Games class next Friday; maybe we'll use game titles instead of celebs.
And I'll be sure to pretend I'm thick if one of my neighbors gets too far ahead of me on points.
(Also, am glad Kill Screen exists.)