Amazon knows me

Maybe you have noticed it about yourself, I am sure you have in fact, nevertheless something struck me recently: Amazon knows me. I mean I receive purchase suggestions by email or when I browse there and it is exactly the stuff I like, things I didn't know existed. Books mainly. Okay, books almost exclusively. I wrote something about it on Facebook, in a moment of both lucidity and paranoia. You could say paranoid lucidity, in fact. Anyway, this is what I wrote: "I know I should not be surprised, but Amazon knows me so much it is downright scary." This is a new great unknown line. If nothing else, at least I got that from my self-awareness.