In a study presented at the recent Society for Personality and Social Psychology meeting, researchers asked a sample group of Facebook users between the ages of 18 and 65 to read some of their friends' status updates. Afterward, those Facebook users rated their lives as much less satisfying than people who didn't check their news feed first.

Among the group who read updates, the study revealed that having 354 Facebook friends seemed to be the tipping point after which people were increasingly less happy with their lives.

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The reason: Much of how we judge our success in life is based on how we stack up against our peers. 'The problem is that Facebook gives us a limited view of our friends' lives, and that view tends to be unrealistically positive," says study author Dilney Goncalves, Ph.D., a marketing professor at IE Business School in Madrid. The more friends you have, he adds, the more likely you are to spend your day enviously reading about someone's paradise vacation, new girlfriend, or job promotion. (Do you update your statuses at least twice a day? Then you might be a narcissist.)

Goncalves recommends unsubscribing from your most prolific braggarts and fine-tuning your news feed. You can choose to read all updates from a friend, downgrade to a smaller portion of their updates, or view only what Mark Zuckerberg's voodoo determines to be their "most important" posts.

Another option: Cut ties with excess acquaintances to reduce your stream to best buds only. That means your dentist, your freshman year hall-mate, and your overbearing ex can all get the axe. (Read How Facebook Has Changed Sex.) When you've reached a comfortable count, "learning about the success of your closest friends can actually make you happier," Goncalves says.

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