Have you ever gone through very closely about your profile name and its important details? This does not mean about the privacy settings that you actually set while maintaining your account. But the information of knowing the "Name Code" of your profile id.
If your profile id is as follows... www.facebook.com/xyz , then "xyz" means the profile name or id that your are using. But the name code for it is different and unique.
To know your unique profile name code in Facebook, do the following:
Step 1: Log in to your account
Step 2: Copy the URL of your profile id
Step 3: Go the link http://findmyfacebookid.com/
Step 4: Enter your copied URL. You can now see the unique name code of your profile.
Now thats how you can know your "Name Code" of profile id in Facebook.