Social networks and social media are ubiquitous in the lives of adolescents and there is growing interest in how this impacts their subjective wellbeing. This research project employs a mixed method approach to explore the relationship between social networks, social media and adolescent subjective wellbeing. A systematic review was carried out to investigate the association between social networks, social media and adolescent subjective wellbeing. A regression analysis was carried out using secondary data from 77 post primary schools. Focus groups and interviews took place across three post primary schools involving pupils, parents and pastoral care teachers. The evidence gathered will help to inform policies and practices regarding young peoples’ use of social media.