According to a new study, your Facebook friends could be making you feel sick. Researchers looked at 165 Facebook users and over half had at least 400 Facebook friends. They were surveyed about Facebook social comparison, self-esteem, depression, anxiety, life satisfaction and physical health. The researchers found those who had positive feelings after comparisons with Facebook friends who are better off, had a heightened awareness of health problems. Those who feel more strongly that Facebook is part of their lives also felt they had more physical symptoms, linking social comparison activity with the perception of worse physical health.