It is a tremendous collision between you private life and your personal life. Now, if you are adding people from work, especially bosses, to such networks, no, you shouldn't be surprised if you get bitten in the ass. However, sometimes a company will actively seek out such information from profiles that are public. In those cases, it IS just like driving by your house to see if your car is in the driveway. Both things take effort to discover, even though one takes significantly less.
And even if you say there's nothing wrong with a company catching someone in a lie about a sick day, because you can just write it off as "wow that guy is dumb" or "wow this why you take fake sick days SMART-like", what if it's something less obvious, like you having a status message that you're really stressed out about your job and you're not sure you can handle it much longer? Is that justifiable reason to have a company psychiatrist examine you, or for the company to search for a replacement for you? A company I worked with noticed the facebook profile of someone they were dealing with another company; my former boss was 'eccentric' and made a joking comment about the middle finger which was apparent on this person's facebook profile. That ended up resulting in actual disciplinary action for the poor girl! And this wasn't a case where someone was searching for dirt; it's like saying you ran into a person the other day and they were wearing a Ku Klux Klan outfit, and someone decided that violates company policy now that they know about it.
Regarding being hung over, the one time I called out sick at one of my previous jobs, I called out hung over. Fortunately my boss was cool enough that I COULD call out hung over, and not 'sick.' But that brings up another point - if you are hung over to the point where you can't work efficiently, is it not better to call out sick? Obviously it's best not to GET hung over in the first place, but that really only affects company business if it becomes frequent and problematic.
"It's Saturday night. I've got no date, a two-liter of Shasta, and my all-Rush mixtape. Let's rock!
"I am just about to be brilliant!
General_Norris, on feminism, wrote:If you lose your six Pokémon, you lost.