Y no skins for FB Profiles

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I really wonder as to y Facebook still hasn't introduced skin or themes for member profiles. So many other social networking sites, have skins for profile. But y not FB. Fb holds the 4th rank in alexa.com. When its so popular, y they haven't introduced skins. I feel so dull wen looking at my profile. What do u think guys. Do u thinks its better to be like this or should introduce skins... Or is there any reason for FB, for not introducing the skins/themes for the profiles????????????????