Again, your wrong.
Facial recognition has been in a usable useful state for several years, I recall visiting a Chinese company who showed me an active working demo of a system able to pick out faces in a crowd of over 100 People, which was insane technology back then, that was about 7 years ago, we have moved on massively since then.
By the use of the word 'mainstream' I mean accepted by the masses.
We use facial recognition all the time on our smartphones now, which shows an acceptance of the tech, nothing to do with social media.
China actively use their facial recognition systems to search out and persecute Uighur Muslims, however our Government does not have that level of control over existing CCTV systems, and there's still alot of grey areas in the police using these types of systems over here.