we require a Facebook Application. Take a good look at Honesty Box application as it is the nearest in terms of an app. used by a closed group. You will need to supply the app. in beta stage to confirm it has no [url removed, login to view] app must be simple to use and be reasonably addictive. Hosting not required.
You will be required to deliver a clean look and feel of the app upon successful bidding....so bear this in mind.
You will need to prove a track record of delivering successful apps.