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.

Movies you pay for - well, sometimes they throw some ads at the beginning now - but generally you pay for ads. And that business model - actually, much more ancient, paying for stuff - is much more straightforward in terms of the incentives of the people who are then giving you the stuff.

Trolling is an ancient problem. It's been around as long as there has been media.

I do think the best thing for companies like Google and Facebook, if they are afraid of this ethical trap of advertising, is they should start letting people pay who want to pay and avoid some of the advertising.

History shows a typical progression of information technologies: from somebody's hobby to somebody's industry; from jury-rigged contraption to slick production marvel; from a freely accessible channel to one strictly controlled by a single corporation or cartel-from open to closed system.

The breakup of Bell laid the foundation for every important communications revolution since the 1980s onward. There was no way of knowing that thirty years on we would have an Internet, handheld computers, and social networking, but it is hard to imagine their coming when they did, had the company that bured the answering machine remained intact.

You know, it's so funny that the internet's become a series of traps where you do sort of innocent things like give your name or address or indicate a preference, I like this thing, and then therefore you open yourself up to a deluge of advertising based on those stated preferences.