Every time you click on a like button on another site, you've told Facebook that you're doing that. And so therefore advertisers know who their fan base is.

Now, he doesn't control the media, but Donald Trump has been incredibly successful in having his face appear everywhere. You cannot go a day without seeing that face somewhere maybe 10 times.

There's always people - it doesn't take many - who have a different psychological makeup than most of us who really get joy out of provoking. They don't always believe the things they say, they just like to watch people go crazy. You know, I knew people like that in elementary school - bullies of one kind or another.

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.

Wikipedia, a nonprofit, is an enormously popular website but has managed to operate without advertising. And, you know, maybe it's a little simpler than Google and YouTube, but it does show there's another way.

If you have a disease and suddenly start getting ads for cures for that disease and it's an embarrassing disease - all that kind of stuff it just gets into that zone of autonomy or privacy where you feel a sense of freedom to be who you want to be.

Markets are born free, yet no sooner are they born than some would-be emperor is forging chains. Paradoxically, it sometimes happens that the only way to preserve freedom is through judicious controls on the exercise of private power. If we believe in liberty, it must be freedom from both private and public coercion.