In Shanghai every billboard, poster, and newspaper advertisement bore QR codes
One could expect people in Shanghai to have QR code mandatory tattooed in a near future, just to fix the inconsistencies of Facial Recognition
We now have quite all a tracking device in our pocket all day long, monitoring where we go, who we meet. The best is that we even pay to have one, and pay again to have a better tracking device every couple of years! These devices record now our digital fingerprints, the picture of our faces. Soon they will analyze our DNA. Is there any sci-fi author who viewed that coming?