I am also p****ed of with people doing it! and have figured out how it's done, thought it was HTML to start with, then maybe SQL, but nope....
It's a silly loophole that should be easy to plug, quite why the site is allowing javascript to be run from within the answer box is beyond me
as for who is doing it... well it's the whiffy (note without the E) not the proper whiffey (with an E) though of course who that really is could be anyones guess!!
Oh and hi dabees... hope things are getting better for you.