It is in the nature of humans, called greed. Most commercials have subliminal messages, a picture of a burger, that you see for one second while driving a car will have its impact. It triggers responses in your brain. The more you are hungry, the more it will affect you. Big enterprises like facebook for example, sell our personal information to advertisement companies. That is why we see exactly what we want and need. This is one of their methods to suck every possible profit out of us. And what is that information worth? About $10. We are not really consumers, for them we are just their product.