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You just posted a comment under your real name saying you browse for porn... so much for privacy

A really poor choice of example. The porn sites are most certainly recording who visits their sites, and I'm sure you'd agree that they have every right to do that, since you're accessing content they've provided, probably on their servers, too. So there goes any privacy, unless you think a corporation's possession of browsing habits guarantees your privacy. Then they will share that information with each other to figure out your preferences and what they can do to increase your number of visits, credit card charges, etc.

Then there's the whole issue of cookies, so they're probably checking what non-porn sites you visit, too, which eliminates even more privacy.

A much better example would have been visiting jihadist websites (hello, NSA data miners). Fancy a scholar who visits the websites for legitimate reasons, and thus gets put onto a Big Brother watchlist. But even there privacy is lost.

Porn sites are prefect examples. You share your private information with sites or people you trust.

I trust that porn sites will not share that information with my mother. Security through obscurity is real and practical for many purposes. There is theoretical security, then there is real life.