What's the matter with a little arbitrage between friends? ConcertIn.com is an interesting music discovery system that uses your Facebook social graph to find bands you and your friends like and, if you can't make the concert, it lets you resell your tickets to your personal circle of buddies. It's obviously a bit shady - some would call this a scalping site - but creator Jan Horna says that his service "brings a clear and transparent user identity to the marketplace," reducing the chance of shady dealings.]]>
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