5.Eduardo Saverin

The smart guy who is famous for his famous suing of Mark Zuckerberg over infringement charges and denying him his share of profit, was the Co-Founder and first CFO, who helped Zuck materialize his idea of a social networking site into a full fledge working machine while still in Harvard.

Stint with Facebook: February 2004

What is he doing now? Angel investor

6.Taner Halicioglu

The massive mean machines called the Hardware Infrastructure for Facebook was set up by Taner. He was the first real employee outside the Co Founders circle and served as Senior Software/Operations Engineer

Stint with Facebook: October 2004 - November 2009

What is he doing now? Lead Reliability Engineer, Battle.net at Blizzard Entertainment