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First one off the top of my head would be YouTube

YouTube is the poster child of "unprofitable success."

Is youtube actually profitable?

Depends on your point of view. Certainly it was profitable for the investors. So is the question has YouTube ever been cash flow positive?

I do not believe that Google breaks out earnings specifically for YouTube, and I am not sure that they differentiate search earnings earned through YouTube as AdSense revenue or for YouTube. But YouTube certainly does generate significant revenue for Google.

http://en.wikipedia.org/wiki/YouTube#Company_history

In March 2008, YouTube's bandwidth costs were estimated at approximately US$1 million a day. [...]

In June 2008 a Forbes magazine article projected the 2008 revenue at US$200 million

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