Google+ got off to a fast start, but LinkedIn CEO Jeff Weiner says the network's growth is unsustainable. Social activity is a zero-sum game, and users simply don't have the time to learn to operate and optimize a new social platform, Weiner argues. "Nobody has any free time. Unlike social platforms and TV, which can coexist, you don't see people using Twitter while they're using Facebook, or using Facebook while they're using LinkedIn," he says.
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