I always wanted a "hate" button to balance things out, I get tired of this feelgood spin that Facebook puts on everything.
Actually I never noticed the problems with the "like" button until I read this. You have a point. I guess the Facebook software can't tell the difference between happy and sad messages. Personally I wouldn't click the button unless I really liked the thing it was attached to. I think it's largely there to provide a way of being polite and paying lip-service to whoever has posted the message without having to go to the trouble of thinking of something appropriate to say. I get emails suggesting I go and "like" this or that, and often when I look, I can't make head or tail of what's supposed to be so likeable about whatever it is, so I often do nothing.
Sometimes there are political messages that uncover stuff such as what the establishment did to Bradley Manning, I might have accidentally "liked" on or two of those, and I'm thankful if everybody took it as meaning "I like that you brought this into the open. More power to your elbow."
I share your pedantic nature. I notice that people say things like "I could care less" when they mean that they don't care, so they actually couldn't care less - the mistake seems too common for it to be a random typo. Weird or what?