https://www.theguardian.com/technology/2019/jul/29/what-is-facial-recognition-and-how-sinister-is-it

As a surveillance technique it’s ubiquitous, but is still a political, legal and ethical conundrum

Facial recognition technology has spread prodigiously. It’s there on Facebook, tagging photos from the class reunion, your cousin’s wedding and the office summer party. Google, Microsoft, Apple and others have built it into apps to compile albums of people who hang out together.