If you’re happy and you know it, thank your friends — and their friends. And while you’re at it, their friends’ friends. But if you’re sad, hold the blame. Researchers from Harvard Medical School and the University of California, San Diego, have found that “happiness” is not the result solely of a cloistered journey filled with individually tailored self-help techniques. Happiness is also a collective phenomenon that spreads through social networks like an emotional contagion.
In a study that looked at the happiness of nearly 5,000 individuals over a period of 20 years, researchers found that when an individual becomes happy, the network effect can be measured up to three degrees. One person’s happiness triggers a chain reaction that benefits not only their friends, but their friends’ friends, and their friends’ friends’ friends. The effect lasts for up to one year.
The flip side, interestingly, is not the case: Sadness does not spread through social networks as robustly as happiness. Happiness appears to love company more so than misery.
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