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 ...

Every Facebook user has a unique ID number. This number gives you some information on approximately -- but not precisely -- when you and your friends ...

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