How to set how to know yours ours Facebook URL. if your facebook profile show long address for example: http://www.facebook.com/profile.php?id=1350532341866&ref=mf.. mean that u dont have specific url for your facebook account yet.. so what u can do to get ur facebook account url is..
simply click here: http://www.facebook.com/username/. (not need to change the [username] to ur username, just leave it as username..)
there the facebook will give u some related username that u can choose. u can just pick one. and remember!! u can only choose once.. once u already pick u cannot change again after this.. maybe can.. i dono.. in different way maybe..
but for those who already set their username.. they cant see any but only showing what ur username that u already choose.. telling that "Your username has been set". so becareful what to choose for ur username.. afraid someday u will feel like to delete ut facebook account just becoz of the bad name..
so Good Luck