[pvaldes]

We are talking about different things here.

For example, lets suppose that you visit your favourite digital newspaper. After reading an article or a howto you see a "like this article?/was this howto useful?/Send us your feedback" button. It seems (I can't confirm it so I could be wrong, just hear it on the TV news yesterday), that facebook was saving silently all this info about preferences from lots of people that aren't neither facebook users nor visiting facebook forums and webs

If we thing about it, wouldn't be much different than to put a creepy guy near the door of a supermarket recording all that you buy to sell all this info later.

[thecrazyone]

Well, _creep_ _shmeep_ (you're just using an ad hominem) you agreed to it when you signed up to free basics. All activities that FB does is according to their ToS and their privacy policies. If you agreed to that, then they are doing it legitimately.