On the Internet, considerable discussion has been made about the emo. Emo started out as some kind of music but has evolved into a clique: a way for teenagers to dress and act. Emoism affects males and females approximately equally.
Aside from wearing black glasses engineers of the 1950s would have worn, emo are notorious for writing angst-filled posts to their LiveJournal or other such blog. They may post pictures of themselves slitting their wrists to which they expect all their online friends to respond with sympathy.
They occasionally write suicide notes and then come back to their blog a few days later chipper as ever. They are prone to overreact to everything.
I have never met an emo personally, and based on what I've read about them, I don't want to.
But it sounds a lot like borderline personality disorder, eh?