Imagine that you're at the shopping mall, and a sales associate follows you out of the store, keeping notes about every other store you visit, and even following you home, so they can find out where you live. That would feel like you're being stalked, and it may even be illegal. But websites like Google, FaceBook, and Amazon do essentially the same thing.
Preach! It is effectively mass surveillance. It has nothing to do with security and everything to do with control and power.