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Re:Don’t Be Evil: How Google Screwed a Startup by rorrr on Thursday April 05, 2012 @06:38PM (#3805008)
Tax IDs and SSN numbers are.
Re:Don’t Be Evil: How Google Screwed a Startup by barrkel on Thursday April 05, 2012 @09:28PM (#3805541)
AFAIK SSNs are not unique (1:1 in either respect) in the US.

http://blogs.computerworld.com/node/5969

Re:Don’t Be Evil: How Google Screwed a Startup by jaggederest on Thursday April 05, 2012 @08:39PM (#3805413)
Business tax ID solves that problem. Incorporate and you get one from the IRS.