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If the American actress Peri Gilpin retweets this article (or, to be more precise, if she retweets my or this publication’s tweets that include a link to this article), it could reach some of her more than thirty-six thousand Twitter followers.

Gilpin, who is best known for portraying Roz Doyle on the popular NBC sitcom “Frasier,” is a celebrity. Hers might not be a household name, but, statistically, the number of people more famous than her rounds down to zero.

If Gilpin retweets this story, the benefit to me would not end at clicks from her followers. My guess is that it would also yield a nice “earned-media” situation in which traffic-hungry Web sites would write meta stories about how

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