The Guinness QR Code Pint Glass Is a Toast to Beer and Social Media
By: Jameson Fink
Published: May 21, 2012

The next time you are enjoying a Guinness at your local bar, along with containing a cold beer your pint glass may also reveal a QR code. Unreadable when empty or filled with a standard, lighter-colored beer, the QR code becomes active when filled with Guinness. (Or any stout, porter, or dark beer, I'm going to assume. If it only worked with Guinness I would be really impressed with the engineering.)
The QR code unlocks the ability to share your Guinness pint-drinking status on Facebook, Twitter and Foursquare, possibly making your friends instantly thirsty. Who knows, they may even join you for a pint.

Comments:
Marni
May 24, 2012

Where can I buy some?
Marni

Where can I buy some?
Jameson Fink

Marni,
I'm not sure; they were distributed to bars but didn't give detail as to where. Contact Guinness and maybe they can help you. (And let me know if you have any luck.)
Jameson