If you’re a cellphone user that is =))
Just by analyzing the calling patterns, the researchers could accurately label two people as friends or nonfriends more than 95% of the time. But the results, published online today in the Proceedings of the National Academy of Sciences, show that the mobile phone data were better at predicting friendship than the subjects themselves. Thirty-two pairs of subjects switched from calling each other acquaintances to friends in the traditionally gathered survey data. These are most likely new relationships that formed during the course of the study, say the researchers, and they left a clear signal in the mobile phone data. Friends call each other far more often than acquaintances do when they are off-campus and during weekends. The pattern is so distinct that the researchers spotted budding friendships in the phone data months before the people themselves called themselves friends.
Finally, the team compared people’s self-reported job satisfaction with their networks of friendship at their workplaces. Because the mobile phones kept track of people’s proximity to each other, the researchers had a clear measure of people’s daily contact with friends at work, not only through calls but through physical proximity. As predicted, the more contact people had with friends at their workplace, the more highly they rated their job satisfaction. And conversely, the less face-to-face contact people had with friends at work, the less they said they enjoyed it.