1. Go to Facebook
2. Open up page source. It does not matter which page you have open.
(Right click, View page source)
3. Use CTRL + F to find OrderedFriendsListInitialData
4. Those series of numbers below OrderedFriendsListInitialData are Facebook profile numbers.
Copy the first one in the list, and put it after
Woah! There is your biggest facebook stalker!
The next numbers are 2rd, 3rd etc...