Due to the contrast needed on QR- and Bar-codes, an empty glass, or one filled with a more transparent liquid such as lager won’t be picked up. Nope, it needs to be filled with the black stuff!
Once scanned, the code directs you to special content on twitter and facebook, allowing you to download vouchers and of course share with your friends. Yes it is still a gimmick, but least it is a different gimmick with some out of the box thinking.
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Don’t forget we have been forced to join Google+ by the search engine giant.