And there's plenty of middle ground in-between: Anyone who posts their political affiliation, sexual preference, religion, graduation date and place, home town, phone number (PHONE NUMBER!?), voluntarily, does so with the specific intention of letting others see it. Things like purchases and browsing habits, personal and unsolicited data mining are somewhat involuntary, and are legitimate privacy issues. Things like getting political ads because you posted your political party affiliation on the page of a public, ubiquitous site, are not legitimate privacy concerns, because you have already chosen to make them public. They wouldn't be on facebook, otherwise: it's not as though you need to put it on paper to remind yourself of these bits of information, and 'close friends and family' would likely already know these details, so on some level it's pretty obvious that you want people to know these things about you easily. That includes corporations. Don't like it, then don't post it. The only thing facebook requires of you is name, age, and an email address. And I've never gotten one bit of spam or directed mail to that address.