Maybe you've heard about the BMJ study that says that happiness wends its way through social networks? Justin Wolfers says:
The study, by James Fowler and Nicholas Christakis, concludes that happiness is contagious within social networks.
According to the authors, your happiness depends on the happiness of your friends, and their friends, and their friends. It’s a fascinating finding, and it was duly reported by hundreds of newspapers. Indeed, according to Fowler, “if your friend’s friend’s friend becomes happy, that has a bigger impact on you being happy than putting an extra $5,000 in your pocket.”
Unfortunately, it’s probably not true.