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Team dating, or small-group interactions, can expose people to diverse perspectives and inform the potential for longer-term collaboration. However, rapidly configuring groups and facilitating interactions among strangers can be difficult, especially in co-located settings. We present ProtoTeams, a system that leverages personal mobile devices to support rapid group formation, to facilitate group activities, and to collect data about the potential for future collaboration. We report on a field study where 406 students in eight different project-based classes used ProtoTeams to interact with classmates through multiple rounds of brief discussion activities before selecting teammates for a term project. We found that the system enables groups to form in about one minute, allows for meaningful interactions with a diverse range of peers, and can significantly influence subsequent teammate selection. We discuss design implications and challenges for in-person team dating in classrooms and other contexts.