How scary is it when you hear, "Facebook has data of people who might not even have ever signed up for it"...
But then, you find out its your own circle that shares it; sometimes unknowingly.

"Shadow Profiles"

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By the way, here's a video related to this.
https://youtube.com/watch/...

That reminds me how i went to a birthday party of a family member and my aunt took some videos. It was late so the videos were dark and blurry at times and you couldn't recognize more than 2-3 people. But when she posted the videos on facebook she made sure to tag every-fucking-one that was on the party.
That's just an example of how we're doomed privacy-wise.

Will take a look later, thanks for sharing!