“…GSN apps use global positioning system technology on smartphones to allow users to connect with other users based on their location. MSM may communicate with sex partners met through GSN apps solely through the apps and choose not to exchange any other contact information, limiting their own and health departments' ability to notify partners of HIV/STD exposure through standard notification methods (Pennise et al, 2015). Historically, partners have been notified in person or by phone, although many health departments have adapted over time to include notification through email, instant messaging, social networking sites, and sex-seeking sites, and internet partner notification has been found to be acceptable to U.S. MSM (Ehlman et al, 2010;Hunter et al, 2014;Klausner, Wolf, Fischer-Ponce, Zolt, & Katz, 2000;McFarlane, Kachur, Klausner, Roland, & Cohen, 2005;Mimiaga et al, 2008;Udeagu et al, 2014;Vest, Valadez, Hanner, Lee, & Harris, 2007).…”