The listing, Seven (7) Facebook FlavorCodes has ended.
This auction is for seven (7) unused Flavor Codes for use on Facebook at: apps.facebook.com/FlavorCodes
According to the FlavorCodes Facebook page, every code wins you some (random) amount of Facebook credit that can be used for games on Facebook.
See the link above for more information.
If you have any questions, please post them in the comments and I'll be happy to answer them as soon as possible!
Update: originally, this auction only offered the winner 5 codes. I now have two more, so the winner gets 7 codes, which will be emailed to the winner at the end of this auction.