[alastairpat]

It's an interesting idea in theory, but I honestly think that the number of people who care enough about privacy to want to log out (or otherwise stop the cookies from being sent to Facebook) would be so low that it wouldn't be cost-effective. My guess is that it would probably be confined to HN's demographic.

The sort of zeroing-in on individuals based on traits/information, however, does kind of remind me of this: http://adage.com/article/digitalnext/target-a-facebook-ad-a-... - not really relevant, but still kind of cool.