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A number of these startup billionaires are paper-billionaires due to Facebook's grossly inflated private market valuation.

I expect to see a lot of these names dropping off the billionaire list as quickly as they got onto it.

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I had a look into this a while back, I could only find a single person who became a startup paper billionaire and then lost it (Jay Walker of Priceline.com), I suspect that the reason for this might be that while valuations may be off, they're unlikely to be off by an order of magnitude.

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