Facebook should include a QR code scanner in their app to do this. I rarely scan QR codes because I would rather type in a short URL than find some QR scanning app. (I realize Google's app can do this, but you end up in an in-app web browser where you are likely not signed into Facebook.) If I could get to a business' official page in a couple of taps in the Facebook app, my chances of interacting with the page would definitely increase.