It's been 15 years since Mark Zuckerberg co-created the social network in his dorm room. But like many teenagers, it's prone to misbehave and worry the grown-ups. Some expect Facebook to implode before it turns sweet sixteen.

We spoke with Roger McNamee, former adviser and early investor, about how the company changed the world in unexpected ways and — in his view — refused to do right by its users in times of trouble.

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