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Re:Are you a Facebook employee? by flyt on Friday August 05, 2011 @02:20PM (#2851076)
Zuck is UID 4. UIDs are no longer allocated in ascending order since maybe early 2007ish.

Here's the full history of how FB UID's have been assigned over time: http://www.quora.com/What-is-the-history-of-Facebooks-user-I...

Re:Are you a Facebook employee? by hugh3 on Friday August 05, 2011 @02:21PM (#2851083)
Mine is on the order of 503 million, and there definitely weren't five hundred million users when I joined in... late 2006, I think.