To be fair, I think you mis-understood me. There's no mention of FB. My example was a news site with 9 trackers. Plain vanilla newspaper - Independent is in London UK. The odd-couter-example might be x, y, or z. It might be google or it might be facebook. but why not just have opt in? The default inference is that [insert number here] would not find it worthwhile enough to bother. [1]
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[1] Also, I did not mention, but on that topic you asked: FB data can be considered more sensitive. They start broadcasting and sharing stuff. Taking it "out of context", and sent to your network. Kind of ironic, but true. It begs the question: Why do you like this? or Why do your read that? Do I want to put footnotes on everything I do? To explain the "context" and the logic of my thoughts? Not really... =D.
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[1] Also, I did not mention, but on that topic you asked: FB data can be considered more sensitive. They start broadcasting and sharing stuff. Taking it "out of context", and sent to your network. Kind of ironic, but true. It begs the question: Why do you like this? or Why do your read that? Do I want to put footnotes on everything I do? To explain the "context" and the logic of my thoughts? Not really... =D.