Estimates suggest that only about 30% of all individuals living with HIV in the U.S. have achieved viral suppression. Men who have sex with men (MSM), particularly racial/ethnic minority young MSM, are at increased risk for HIV infection and may have even lower viral suppression rates. HIV testing rates among MSM are low, and when tested, racial/ethnic minority young MSM have disproportionately lower rates of retention in care and viral suppression compared to other subgroups. This article describes the design and development of weCare, our social media-based intervention to improve care linkage and retention and health outcomes among racially and ethnically diverse MSM, ages 13-34, living with HIV that will be implemented and evaluated beginning in late 2016. The intervention harnesses established social media that MSM between these ages commonly use, including Facebook, text messaging, and established GPS-based mobile applications (apps). We are using community-based participatory research (CBPR) to enhance the quality and validity of weCare, equitably involving community members, organization representatives, healthcare providers, clinic staff, and academic researchers.