$800,000,000 / 542,624 Facebook fans = $1,474 per person. Crowdsource the funding of the new stadium. I dig it.
The money could be held in escrow, and used to mint a bond equivalent digital currency aka Bills Coin, that the team could issue that would be redeemable fractionally over a 25 year period. Assume the Bills would pay back the currency at 2.5% interest over 25 years. Bills Coin would be redeemable at BuffaloBills.com, or at the stadium box office, to buy everything from tickets, to jerseys, or concessions.