I'm almost certain facebook has no "shadow profile" of me. Can't say the same about google though whose reach stretches far deeper and wider than facebook's. And that's not a facebook problem. That's a internet/social media problem. I'm more worried about google's "shadow profile" or my ISP's "shadow profile" or my financial insitution's "shadow profile" than facebook's. Also, I don't see how "breaking up" facebook would do anything to solve the privacy problems.