Cupid’s arrows will be making their return next month, and soon an abundance of heart-shaped candy boxes and red-and-pink-hued flower bouquets will dominate store shelves. Instead of taking the ...

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With every Christmas card I write, I’m dreaming of a white Christmas, but I’m also pondering “The Strength of Weak Ties,” a seminal 1973 paper by the sociologist Mark Granovetter, then of Johns ...