Nielsen has released a report [download page] called “The Mobile Consumer: A Global Snapshot,” in which it examines device penetration, activities, and advertising across 10 countries. Among the findings, 24% of American smartphone users surveyed during Q2 2012 reported scanning a barcode or QR code in the previous 30 days. Of the selected commercial activities, that ranked behind mobile banking (38%) and location-based services/GPS (48%) in use, but far ahead of NFC/mobile wallet use (3%).

via QR Code Scanning Not Yet A Mainstream Activity For US Smartphone Users.