The Internet is a promising medium to strengthen participation in Human Immunodeficiency Virus (HIV) prevention among young men who have sex with men (YMSM). This study engaged YMSM from Bali in codesigning online HIV prevention using a series of participatory action research focus groups. Further, this research utilized Habermasian critical theory of communicative action to interpret the findings. This was framed around the current mismatch between HIV prevention, the "systemworld", and the lived reality, or "lifeworld", of YMSM in Bali. Using a model of intervention called "So Us", YMSM aspired to HIV prevention which reflects their identity, language, and interaction style.
Keywords: Bali Indonesia; Habermas communicative action theory; Internet-based HIV prevention; Young Men Who Have Sex with Men.