People are missing a key point here. Well, several, actually. Yeah, it doesn't matter if you're friends or family find out you got drunk last Saturday, and fuck 'em if they can't take a joke, right? But there are, for instance, states (29 I believe) where you can be fired for being or appearing to be gay. So any joking or Liking of "Glee" or "Le Cage aux Folles" could make it so that you can't get an apartment. But also, you might leak enough information so that it would be easier to steal your identity (mother's maiden name or favorite movie or first school you attended). "This is John, I've known him since we went to ABC elementary school." Lots of folks don't realize how much information is now available about everyone that just wasn't 20 or 30 years ago.
Also, you're 6 foot, dark haired and named John Smith. Well, we wanted to hire you, but here's a 6 foot, dark haired John Smith on Facebook saying he wants to "kill the pigs". Sorry, we can't take a chance in hiring you.
It doesn't matter if YOU care or not. It only matters how much hassle it can cause you at some point. Think it won't happen to you? Good luck.