https://www.engadget.com/2013-09-18-google-adid-an-anonymous-identifier-advertising-cookie.html
Google's AdID, an anonymous identifier for advertising, could replace the aging cookie
Sep 18, 2013 - You know the drill: accept the cookie, delete the cookie, empty the cookie bin, and so on. Mostly, it's an exercise used when attempting to get your mum's PC...
identifier for advertising