Depending on whom you ask, it was either the apex, the inflection point, or the beginning of the end for Silicon Valley’s startup scene—what cynics called a bubble, optimists called the future, and my future coworkers, high on the fumes of world-historical potential, breathlessly called the ecosystem. A social network everyone said they hated but no one could stop logging in to went public at a valuation of one-hundred-odd billion dollars, its grinning founder ringing the opening bell over video chat, a death knell for affordable rent in San Francisco. Two hundred million people signed on to a
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