The old Yankee Stadium was laid to rest in 2010, but much of the old stadium was salvaged (I've even seen cuff links made from the seat cushions).
Many of the seats have survived and according to Mashable:
'Twenty such seats will be scattered around New York City starting Monday. Fans who find the seats and scan a QR Code will be checked in to Facebook Places. Once a fan checks in, they make themselves eligible to win VIP tickets to a 2011 Yankee game in MasterCard’s exclusive Batter’s Eye Café.'
How technocool is that?
See the original post here, http://mashable.com/2011/08/01/mastercard-facebook-places/
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