Old URLs Don't Die... They Come Back to Haunt You

What do Heinz Ketchup, QR codes and adult Web sites have in common? Apparently, everything. QR codes are those two-dimensional barcodes you often see on ads or consumer products. Just like regular barcodes encode numeric information, QR codes encode full text. They often are used to reference Web addresses, or URLs. For example, the following QR code, when scanned with a mobile phone app, will link to this site: