Threads/GettyWe all know that if you want to receive, you’ve got to give, too. And that seems to be the case with holiday cards. A Threads post got heated this week when one mom explained that as soon as she stopped sending out Christmas cards, she stopped getting them, too. She realized, disappointed, that she must only be getting holiday cards from a significant number of people because she sent them a card first. “When I stopped sending Christmas cards, the effect was immediate,” she wrote. “We received less than half the holiday cards we normally received that very same Christmas. Since th...

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