[justinpaulson]

So you don't mind ads as long as they are completely random ads that you may not care about. But if they try to get some info about you to show ads that you might actually be interested in, then you are pissed? What!? What do you think they are doing with this information? All they are doing is catering ads to your preferences.

[dllthomas]

You raise an interesting point - that there is a tension between respecting the privacy of a user and making ads most useful to them.

That said, I don't think the rest of your post is well supported. Surely they are using the info to try and target ads, but what prevents them from using it in other ways (including selling it to other people who want to use it in other ways) if they think it can make them more money? Probably, most of these companies aren't going to knowingly sell it to anyone who will use it illegally because they could be culpable... but there are probably things I don't want done to me that don't involve actual illegality. An example off the top of my head might be feeding embarrassing info to a tabloid. And even that stays out of the realm of "what if things really went bad?"

[Schwolop]

But my preference is _really_ to see no ads.

What you cite as "my preference" is really "what the advertising backend has deduced I'm most likely to buy" - that's certainly better for the advertising company, very likely better for whoever's receiving revenue from showing the ads (averaged over all users because yes, targeted ads do work better), but it's not actually _better_ for me. From my point of view as someone who didn't actually want to spend any money, it's worse, because I'm now more likely to spend the money.