Abstract: The prevalence of devices (especially smart phones) with short range communication modules propels the development of opportunistic networks and its applications. Social activities formation (SAF) application was proposed.To facilitate data dissemination in opportunistic networks, broker-based protocols arc often used. However, existing protocols assume that brokers are willing to contribute, ignoring the selfish nature of human. Considering the individual willingness, user may not take mission which leads to packet loss problem. To this end, STBS (Social Tic based Broker Selection Algorithm) was proposed based on social tics and popularity. Experiments with smart phones data sets Reality Mining provided by MIT evaluation show that STBS has better performance and can provide better social activity support.

Key words: Willingness, Opportunistic networks, Broker selection, Social activities formation