Plus, it's easier to be verbose when feeling a strong emotion -- however, if it's a happy strong emotion, one is usually off doing whatever started the feeling. If it's a negative one, often the opposite, and a computer may be near, and voila, a depressive post.

I have a friend who is always down in the dumps on LJ about his work, his hobby, and his progeny. It's very depressing; maybe one in 10 posts (or less) are "life is OK" posts. I sure hope it doesn't reflect reality.

You're not in that camp yet, Jducoeur, but it's a good thing to guard against.