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I too have a QR code on the back of my business card but it is not the URL to my website. It is a vCard containing all of my contact data. I figure that it's much more useful to put my info into their contact list than to send them to my website. It saves actual work (entering my contact info manually) and adds value to what might otherwise be seen as a gimmick. It's also a good conversation starter.
3 years ago on 3 Tips to Use QR Codes For Information, Not Destination