Phones have location devises, not to mention they track the phone number as you enter the stores and as you shop they follow you in the store. They also use face screenings to ID you and plain old cameras to track you.............if you have a credit card with a magnetic strip they scan it as you enter and do the same things. As you use a credit card to buy at different stores they are tracking your travels and what your buying where. I did a recent Refrigerator search on line and suddenly the ads on the computer screen was busy popping up the brands I looked at.
This is nothing new, it been around for a few years now.
AKK