This study investigated the effects of active private, passive private, and passive public social media use on adolescents’ well-being. Intensive longitudinal data (34,930 assessments in total) were collected through a preregistered three-week experience sampling study among 387 adolescents. Person-specific, N=1 time series were investigated, using Dynamic Structural Equation Modeling (DSEM). We identified a typology of person-specific social media effect patterns, consisting of 45% insusceptibles (i.e., adolescents who experienced no effects of the three types of social media use), 28% negative susceptibles (i.e., adolescents who only experienced negative effects), 26% positive susceptibles (i.e., adolescents who only experienced positive effects), and 1% mixed susceptibles (i.e., adolescents who experienced both positive and negative effects). Overall, the findings show that different adolescents respond to social media differently. Yet, active private, passive private, and passive public social media use only rarely yield different effects within one and the same adolescent.