Since the best-selling author joined the social network in December, he’s become a new favorite source of commentary on books, movies and TV. He even had to make his first apology two months later, begging the Twitterverse for “Mercy, please” after he tweeted a controversial opinion about Dylan Farrow’s New York Times letter to another writer. That said, his take on Justin Bieber is spot on. — Olivia B. Waxman
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