There is no trail to my facebook account, I haven't got one! If you've got a fb account and don't use any advert blocking, script blocking and accept all cookies thrown at you, then all websites track you and know where you've been, who you are, where you live and what you're likely to buy. Even if you take all these precautions they can still track your computer's fingerprint (browser, version, add-ons, operating system etc) I worked for an international company for a while that was involved in this sort of thing and it was shocking what information they knew about everyone in Europe and the Americas. The NSA have got nothing compared to the big boys of data handling. The NSA are only interested in potential terrorists or political adversaries, but the big advertisers and data handlers are interested in everyone who has got a bank account, credit card or 10 cents in their pocket.
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I've left WP indefinitely.