We present evidence on the causes and consequences of workers’ social ties in the workplace on individual and firm performance. To do so, we combine firm personnel records on individual productivity with a survey we administered to workers to identify their social network of friends within the firm. Our findings indicate there are social incentives — the presence of friends affects worker’s beh...

background: socioeconomic status has been found to have a significant impact on the health as well as risk behaviors of adolescents across different contexts. this study was conducted to assess the effect of social relations adjusted by social class on physical and psychological well-being of adolescences in teheran, iran.     methods: this was a cross- sectional study and carried out on 1,742 ...

PURPOSE To explore the effect of perceptions of friends' romantic and physical behaviors on adolescent sexual behavior and the relative influence of friends' sexual behaviors and maternal attitudes on age at first sex. METHODS Using longitudinal data collected from 1943 adolescents who have never had sex at baseline in Cebu, Philippines, logistic regression assessed whether adolescents' perce...

In August 2010 Facebook launched Places, a locationbased service that allows users to check into points of interest and share their physical whereabouts with friends. The friends who see these events in their News Feed can then respond to these check-ins by liking or commenting on them. These data consisting of the places people go and how their friends react to them are a rich, novel dataset. ...

In August 2010 Facebook launched Places, a locationbased service that allows users to check into points of interest and share their physical whereabouts with friends. The friends who see these events in their News Feed can then respond to these check-ins by liking or commenting on them. These data consisting of the places people go and how their friends react to them are a rich, novel dataset. ...