These are the most valuable? What are they smokin'? (w/ video!)

highest evaluated startups

I just read this list of most valuable startups. The thing is most of these are websites, involved with web 2.0 social networking technology.

Where is the revenue streams from this? How are they getting 9 billion dollars from a social networking site?

I mean think about that in comparison to say Jet engine parts or even microprocessors.

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