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Considering he made his first millions from software he might know what he is getting into.

Mark made money by selling his internet streaming company to Yahoo before the Tech bubble burst in 2000. So he might know a thing or two about tech bubbles. That said, the difference between back then and now, is that is a global bubble. Not just VCs and companies in California pumping this bubble. You got Germans, Swedes, Brits, Chinese and basically all over the world pumping this bubble, and I think is far from over, actually I think is just getting started.