Social media didn't begin with Facebook or Friendster -- it's a 2,000-year-old phenomenon, according to Economist editor Tom Standage, whose new book is called "Writing on the Wall: Social Media -- The First 2,000 Years." Social media as we know it today "scratches a prehistorical itch" for news and gossip tailored to personal interests, Standage says. "The only surprising things about social media is that we are surprised by it," he says.

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