Social critics claim that emerging adults are subjecting themselves and one another to a variety of risks through the use of mobile dating and hookup applications, or “apps.” These narratives emphasize concerns about authenticity, the threat of sexual predators, and changing expectations about the nature and emotional intimacy of relationships. The use of apps among emerging adults presents risks for individual users and for social relational patterns, both in the digital world and “on the ground.” In this chapter, the authors analyze the theoretical and empirical risks of mediating hookup culture through the use of mobile dating apps and discuss the potential risks to app users, such as harassment, cyberstalking, and sexual violence. Next, the authors explore the social risks pertaining to authenticity, trust, the quality of relationships, and conflicting understandings of social norms and acceptable behaviors. Finally, the chapter concludes with suggestions for future directions in research related to the use of hookup apps and its related risks.