If you want to know about who has visited your facebook profile then
Sorry! it’s not possible on facebook. Other social website like orkut provides this function.
Facebook not allows this feature and not gives this facility to users.
Facebook not provide this function who has visited to your profile because facebook wants all users freely move to other profile and view the profile. If any such application exist then that application is against facebook.com policy.
You can investigate other profile without any restriction. There is no facebook trick.
Some applications claim that they can provide the details about your latest profile visitors but all those applications are fake. They are just promoting their application and generating Random Recent Visitors List. Now a days facebook is removing all such type of applications because they are breaking facebook TOS.
So you can not find who is view your facebook profile.
If you know such applications on facebook then please share with us. Write your comments below.