The holiday card. We all love to find them in our mailboxes, but often dread the act of planning, producing, and mailing one out ourselves. We run out of time, forget until the last minute, or ...

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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 ...