Studies on mobile applications for ad-hoc networks predominantly rely on simulations to evaluate various distributed algorithms. This has given rise to the need for realistic mobility models that incorporate social characteristics of human mobility. Based on basic properties of user movements captured via GPS traces and user interviews, we propose FRIW (Free Radicle Inspired Walk). FRIW leverages the free radicle concept from chemistry and social network theory to model social ties and group mobility in a campus setting. We find that FRIW is successful in generating realistic mobility patterns that can be used for modelling user movements in ad hoc network simulations.