Do they know that they can have spaces in their username? I can't remember noticing one when I joined, but then again my original username was one word. Just because I see a lot of newer people with underscores in their name, and I think 'Why?'. I mean, underscores are a pretty general internet standard, maybe people are just assuming that TB is the same. Unless there is a little note already on the register page or something.
Just wondering.
Edit: This just popped into my head now, so I guess I'll tack it on here. Is there some sort of a 'find a teacher in your area' type of function? If not, could there be? Seems useful, plus it would get rid of all the posts that are people asking for a teacher. If this function already exists, nevermind.