About me being downvoted - yeah, I figured I would be, because lots of people here use voting as "I (dis)agree" or "I (don't) like" button instead of "post is (not) useful" button. For the record: I would rather live in a world where such tracking was not possible and/or allowed, however, this is just not the case. As business you would be stupid to not consider using such data though. I personally would welcome a browser with privacy built in (for instance, browser which would disallowed all references to external domains - including images, JS and similar). But in reality this probably wouldn't fly.