Username naming bug that needs plugging

So it seems there are quite a few users here and there posting around with "nameless" usernames. This should be plugged asap, as this could be used to troll 'anonymously'

Do you ever apologize after insulting people and then typing a smiley face?

Don't need to. This is it right here, you little coward :)

Why are you being so nasty?
I thought you was nice person.

Actually, I'm not. I'm exposing the fact that this bug in the system is ripe for exploitation by trolls such as yourself. You're the foolish one if you think I am being an idiot.

But I didn't say you was an idiot, I said you was nice.