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I think it can be a remnant of the previous anti-spam restrictons, at least that'd be my guess. IIRC, you couldn't post, change profile description or have links in comments until you completed first 'hubwheel' (that thing next to your nick in the top navigation bar). Guessing after mk, I wouldn't be surprised if it was just hidden via CSS, therefore accessible and editable with 'inspect element' feature in most browsers. Can't hurt giving it a try, can be fun.