"If you have a weakness for furry slippers or something, you might end up with that kind of advertising. It's a very complicated algorithmic decision. There's no one dude who's deciding what ads are going with things, and it's very individualized also. And that's the idea of collecting information is that in theory, you're showing people things that they should want to see or for which they are a good target. So, no, there's no master person."