Well, whilst that is a nice idea I can't see it happening anytime soon. Attempting to work out if a part of a URL represents a user name seems like a bit if an

Well, whilst that is a nice idea I can't see it happening anytime soon. Attempting to work out if a part of a URL represents a user name seems like a bit if an impossible task to me. I guess you could encode rules for specific well known sites but I doubt you could ever create a general solution, and if a site changed its URL you would become unstuck until you rolled out a fix.