What are you talking about? A facebook profile? Or a Facebook page?
It sounds like you're talking about a facebook profile to me.
If profile: I can see why they disregarded it. Your profile is your personal destination. If I wanted "MRGTB Forums" or "MRGTBForums" I would have created a new facebook page.
And yes, FYI, you can have a URL username for a page, all you need is at least 20 fans. By least, I meant less in this situation.
Your profile can have a URL simply "MRGTB," and facebook would not have thrown a hissy fit. That is, afterall your brand.