Don't you just love it when a billboard ad tracks your face? Me neither, and nor do the inhabitants of over 20 cities in the UK, where new electronic advertising screens have popped up in residential buildings.
Condemned as "creepy as hell" by campaigners, the screens are allegedly capable of recording viewers' faces order to track metrics, such as average "dwelling time". (Spoiler alert: none of the examples in our roundup of the best billboard ads feature face-tracking cameras.)
