There are companies that re-populate cookies. The company formerly known as Rapleaf did this. You use computer A, the you go to device B, log in to some random

There are companies that re-populate cookies. The company formerly known as Rapleaf did this. You use computer A, the you go to device B, log in to some random site that is a Rapleaf partner, and they dropped a cookie connecting you to your other device based on your email address. Not particularly shocking anymore, certainly not as Facebook's new cookieless multi-device ad network rolls out. It is going to be very interesting 10 years or so out when we have physical billboards running facial recognition delivering targeted ads. Perhaps 20 years out, a very customized AI salesperson creates a demographic profile and knows exactly what to say to maximize the probability of us buying. The curious thing about advertising law is that this big data & super targeting stuff has become critical for political campaigns. Laws which throttle back on the privacy encroachment would likely neutralize a lot of the effectiveness of a modern US Presidential campaign.