It can be from any sight or game. Doesn't have to be Bungie.net.
The worst username I saw was, farts123456.
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[quote][b]Posted by:[/b] HALO3PW3NGE Tried linking my gamertag to a different WLID but it didn't work. Tbh i don't really see the point in all this. I'd rather delete my account on here so I don't have to deal with the attrocity known as my username.[/quote] But you'd need to create a new one if you wanted to post again. Butno, you cannot delete your b.net account.