I have a couple people on my friends list who are very frequent visitors to the Land of Sad (oh, excellent phrase!). Every little hangnail, headache, traffic jam, and long day at work is a Momentous Personal Obstacle. I'm fine with complaining (I do it too, so it must be okay, right?

), but it's the drama of it, the woe-is-me attention-seeking that gets on my nerves.
I think we've all known people in real life who are sighers or sniffers or forehead-rubbers; actually, I'm pretty sure I've been guilty of it myself at various times. When something (something minor) bothers them, they don't deal with it or come right out and talk to a friend about it. They wallow in their sadness and sigh frequently or rub their foreheads anxiously until some kind soul comes along and asks what's wrong. I'm not talking about people who truly are despairing (and I know real depression can make something that seems minor into something far worse; I'm not talking about that, either), but people who thrive on attention and pity. If they have to be direct about what's bothering them, it completely ruins it for them. The Internet analog to this (since you can't really rub your forehead on Facebook--well, you could, but you'd smudge up the screen) is the frequent short, sad, cryptic status update.
Things you type are broadcasted to everyone you know. My opinion is, if you would not say it out load at a cocktail party, you should not say it on Facebook.
I too believe this, which is why I'm not facebook friends with anyone I would not attend a cocktail party with.
My whole point was that you don't know everyone at a cocktail party. Or you have varying degrees on intimacy with them. A blanket announcement or your current mental state, etc. is not generally appropriate.
I think a LOT depends on who your Facebook friends are. My circle of Facebook friends is not particularly intimate. They're all people I have had contact with in one way or another--through here, my blog, high school, real life, whatever--, but most of them are just casual acquaintances. However, I DO know people whose Facebook friends consist entirely of close friends. In that instance, it's not like a cocktail party. It's like a small gathering of your closest friends to whom you would tell anything anyway. Obviously not the case here, but I think we should keep this in mind when discussing Facebook issues.