I.F. Stone  famously joked  that he treasured reading  The Washington Post  because he never knew where he’d find a Page One story. Nobody except me reads the news on paper anymore (the  Post ’s  average paid daily circulation  has fallen below 100,000), so the new metric is how much play a given story receives on social media. To update Stone: I treasure all legacy media (not just the  Post ) because I never know where I’ll find a story that should have gone viral. The latest is “ I’ll have