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Re:GraphQL Working Draft by ci5er on Thursday July 02, 2015 @12:01PM (#9819751)
You could always try...

  - https://www.facebook.com/1
  - https://www.facebook.com/2
  - https://www.facebook.com/3
My guess (and there may even be apocrypha about it), is that these were old registration test accounts that didn't survive the first Zuckerbergian purge.
Re:GraphQL Working Draft by leebyron on Thursday July 02, 2015 @12:22PM (#9819901)
Correct. SQL auto increment keys plus test accounts resulted in Zuck being 4.