True horror story #1. I manage Google Analytics for one of my clients. I can go into their analytics and see what other sites their customers visit. True horror story #2. My kid was texting with a friend and he was telling her about something he was thinking of buying. Then she started getting ads on the internet for the product he’d told her about. In text. Tracking is insidious. True horror story #3. When I moved across the country and rented a place in my hometown, Facebook suggested my landlord as someone I might want to follow. Tracking is truly insidious. Most people have no idea how much so.