This method requires no apps, just a browser like Google Chrome.
Step 1: While logged in, go to the facebook homepage, or your own profile page.
Step 2: Right click and open the page source (for Google Chrome, "view page source")
Step 3: Open the find menu (Press Ctrl + F) and enter "OrderedFriends"
Step 4: Enter the numbers in the lists that follow (For example, 11111111111) after "facebook.com/"
Step 5: The profile that comes up is that number. The first in the list is the person who visits most, and so on in declining order.
