Lately I've been hearing complaints from my techie friends about San Francisco. Sure, the city is a mecca for anyone who wants to build a startup—with ample capital, helpful angels, and some of the best software talent on the planet. But it's becoming a monoculture. “You go to dinner and tech is literally all people talk about: tech, tech, tech,” sighs my friend David Silva, an engineer who lived in San Francisco for five years before decamping for the East Coast.

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