A novel application and user interface for facilitating group interactions over a network integrates messaging, file sharing, media playing, journaling, profiles, and gaming into a cohesive environment. The groups facilitated by the invention are persistent and mobile in that a user does not have to recollect and reconfigure the group each time he or she wants to interact with the group online and, while online, the group may be taken from one activity to another without having to disband and reconnect at the second activity. The application is modular so as to be extensible to include other activities and functionalities. In an embodiment, the group interaction application utilizes a peer-to-peer network environment to facilitate network communications between group members.