No matter how many friends you have on Facebook, the number of truly close friends you can maintain throughout your life may be hardwired. Researchers logged the phone calls of teenagers transitioning out of high school and into either the workforce or college for 18 months. Even as the teens made new friends, the structure of their social circles remained the same: if they had four close friends at the beginning of the study, they had four at the end of the study as well -- though not always the same four friends. Each of us appears to have an individual “social signature” that determines how much time and emotional capital we have to expend on our friends. Has the number of close friends you have remained constant over time?
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