Work related Modern worlds young generation use significant time on mobile phone and social networks. It has become a day today activity for most of them. The area of this study become more concerned when the time use of on these activities takes priorities over other activities. Excessive time use on these activities has effects over an individuals health, behaviors, financial status, interpersonal relationships, mental health etc. In this paper an attempt is made to study the adverse effects of excessive time use on mobile phones and social networks among youth by using Fuzzy Cognitive mapping (FCM).