Definitely in a rough state. I've connected my Facebook and Foursquare accounts, but there's still a "Log In" button. When I select it, it takes me back to the screen to connect accounts.
Still, a very interesting idea. I'll start using it to identify foods and see how it goes.
Your group sounds interesting. I saw the mention of a weight set point on your site. Have you read about the late Seth Roberts' Shangri-La Diet and it's use of flavorless calories to regulate that set point?