Some of us aren't retarded. We don't keep our passwords. That way no one can ever login as us.
Jesus said "by their fruits ye shall know them."
Pay attention to what is said, not so much who is saying it. "Ad hominem" will always be a logical fallacy.
Translation: They ban pedophile porn spammers.
The handshake helps to identify accounts that are less known because they are new. It makes people more suspicious towards them especially when they behave weirdly. They are a new, unknown person, and nobody can predict what he is up to.