People visit social networking sites like Facebook for reasons including the positive emotional experience they enjoy and want to repeat, a new study has claimed.u00a0

Measurements of physical and psychological responses such as breathing rate, brain activation, and pupil dilation, designed to assess a person's psychophysiological state were collected by researchers from IULM University, Catholic University of Sacro Cuore, in Milan, Italy, and Massachusetts Institute of Technology, Cambridge.u00a0