TV ratings used to be collected from panelists using a wearable device that literally had an always-on microphone recording you 24/7 : https://en.wikipedia.org/

TV ratings used to be collected from panelists using a wearable device that literally had an always-on microphone recording you 24/7 : https://en.wikipedia.org/wiki/Portable_People_Meter https://en.wikipedia.org/wiki/Portable_People_Meter How is Onavo worse ?