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Re:Zuckerberg's Big Facebook Mistake by uptown on Friday July 27, 2012 @04:38PM (#4303467)
Going public wasn't required by their investor count, but they would have had to have audited financials, so the benefits of remaining private would have been reduced anyway:

http://www.quora.com/Why-does-Facebook-need-to-go-public

Re:Zuckerberg's Big Facebook Mistake by sbov on Friday July 27, 2012 @06:39PM (#4303904)
Facebook passed the 500 shareholder mark back in 2008 and got an exemption.

I've had no luck finding out why they then had to observe the rule by 2012 though.

Re:Zuckerberg's Big Facebook Mistake by mohawk on Friday July 27, 2012 @06:51PM (#4303944)
Passing the 500 mark means you have to hand in SEC filings, nothing more.