QR codes are dead, an internet marketing strategist wrote in AdAge in 2013. The murderer: "easier-to-use apps." And yet, four years later, that isn't the case. Apps have become even more prevalent and perhaps easier-to-use, but Facebook and Snapchat, two of these most-frequently-used apps, are pushing a present and future of QR codes. Spotify introduced its own codes last week. It's difficult to determine how QR codes became "cool" again.