THE CONNECTOR | Hoffman (pictured in his Silicon Valley office) is a newly minted billionaire, courtesy of his LinkedIn IPO. ILLUSTRATION: Photograph by Brigitte Sire Reid Hoffman founded his first social site, called SocialNet, before Mark Zuckerberg had even started high school and has been in the vanguard of the social-media movement ever since. The 44-year-old venture capitalist, known as "the

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