Although HIV testing and highly effective antiretroviral therapy (ART) have improved survival with HIV, the relatively low level of ART adherence presents a significant public health challenge in terms of the potential to transmit HIV. Preventing transmission in virally unsuppressed HIV+ MSM who have unprotected anal intercourse (UAI) with serodiscordant partners can have a great public health impact. As new HIV infections in MSM have been attributed in part to increased access to sex partners online, it is critical to deliver behavioral interventions to HIV+ MSM online to reach many high-risk men at a relatively low cost.