Leverage was/is a "high-demand group" in my social circles in the bay area; if you're familiar with it, here's a pretty restrained description of the more undisputable, common-knowledge features of this group:
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I’ve never heard about “Leverage” and wonder where to look for additional context?
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There's not a lot out about it right now, though I suspect there might be more published in the future. The guy who founded it, Geoff Anders, is still working and getting funding.