What Are QR Codes? on Tuesday, 10 April 2012. Posted in Marketing and Advertising Do I need One? They are popping up everywhere: soda cans, posters, business cards, and pint glasses.So what are they? Tweet Comments (1) Eric Johnson 24 May 2012 at 01:03 | # This looks pretty cool. How do I get one? reply Leave a comment You are commenting as guest.