PurposeEvidence and clinical policy support that providers screen and counsel for media use for youth, but most pediatricians lack this training. The purpose of this study was to test a primary care provider (PCP)-delivered intervention to promote safe social media use among youth. MethodsWe enrolled pediatric PCP practices for this clinical trial to test a social media counseling intervention (SMCI) between 2011 and 2013. Youth were recruited during clinic visits; follow-up interviews were conducted at 6 months. Outcomes included media behaviors and caregiver communication. Multivariate regression models examined associations between social media counseling and PCP counseling score. Multivariate logistic regression evaluated four social media behavior outcomes. ResultsA total of 120 practices enrolled; PCPs in the SMCI were more likely to provide social media counseling (B = 1.43, 95% confidence interval [CI]: 1.1–1.7). Youth whose PCP received the SMCI were twice as likely to report a decrease in online “friending” of strangers (adjusted odds ratio = 2.23, 95% CI 1.17–4.25) and were more likely to report communication with their caregivers about their social media use (adjusted odds ratio = 1.2; 95% CI: 1.1–1.4) compared to youth whose PCPs were in the active control group. DiscussionYouth whose PCP had received social media counseling training reported a higher receipt of counseling about social media and improved safety behaviors.