Dunbar's number, which caps the number of people with whom we can have stable relationships at 150, has never really seemed to jibe with the world of social networks, where most of us have far more than 150 friends or followers. For Microsoft's danah boyd, social media means an ever-expanding circle of acquaintances, not friends, that technology allows us to keep from drifting to the wayside. Meanwhile, for the Conversation Agent's Valeria Maltoni, even if the number of people technology allows us to stay connected to is greater than 150, companies still need more than 1 or 2 people managing their firms' relationships with customers if they actually want to form a real customer community.

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