[aaronbrethorst]

GitHub's valuation 2 years ago was $750mm. I'd be shocked if they hadn't cracked the $1bb marker yet.

http://allthingsd.com/20120709/github-valued-at-750m-with-fi...

[argonaut]

GitHub raised $100M from Andreessen.

[doobiaus]

Github was bootstrapped for 4 years before taking funding. Eventually everyone does when they need to grow rapidly.