It's too easy to track where you've been walking inside a shopping mall, and if you're the only person in the elevator, it can trace that you were previously lo

It's too easy to track where you've been walking inside a shopping mall, and if you're the only person in the elevator, it can trace that you were previously looking at {laptops,refrigerators,lingerie} and play an ad to promote the product to get you to seal the deal... "Today at the lingerie department we have a 20% discount!"