How to Determine a Friend's ID Number on Facebook
How to Determine a Friend's ID Number on Facebook. Every Facebook user has a unique ID number. This number gives you some information on approximately -- but not precisely -- when you and your friends joined Facebook relative to each other. A lower number suggests that you joined Facebook earlier than a friend ...
Look to the bottom of your browser; you should see a URL appear there. Your friend's Facebook ID number is the last solid string of numbers in this URL. It may ...