It sounds like a kamikaze mission: an upstart with a meager number of users and no capital squaring off against Facebook, a social networking juggernaut with more than 400 million members and a $15 billion valuation. Leo Shimizu, left, and David Chen founded Pio.io, a social site that emphasizes privacy. But despite those odds, a handful of start-ups are eyeing the social networking industry with renewed interest.
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