Doesn't your argument apply to google and most search engines too? They also sell ads targeted according to the information they have about you. And hey, just

Doesn't your argument apply to google and most search engines too? They also sell ads targeted according to the information they have about you. And hey, just like google and others, they allow you to adjust your privacy settings to a great degree, have you visited the privacy settings lately? Yes, they have few controls in the past, but such is the nature of building and iterating, you can't get everything right in the first try... To the argument of giving information to facebook and not knowing where it will end up, heck, that's true for every company and person that you come across!