I'm looking to create a web application that will effectively be a betting website. However, we will not be taking the bets. I want the users to be able to create and post bets on anything they want (focusing on sporting events) then other users to accept the bets or negotiate the conditions by offering counter-offers to whoever posted the bet. The basic functions of the website will be to create a profile, the ability to search through prospective bets based on the sport or the amount being wagered and to create a friends list (ideally through facebook). Accepting deposits and payouts will be a later step, I'm just looking to have a very beta version to show potential investors.