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Background: With an HIV incidence of 1.00 skewed against women (1.51), adolescents in South Africa are at high HIV risk. This paper assesses young adults' (18-24 years) knowledge, attitudes and practices regarding HIV prevention in Nkangala and OR Tambo districts.Methods: A cross-sectional household survey was conducted in two districts in 2017/8. Participants completed computer-assisted self-interviews on HIV knowledge, attitudes, behaviour practices, use of social media and condom use at last sex (proxy for high-risk sex). HIV knowledge was assessed using the South African-adapted UNAIDS scale. Descriptive analyses were conducted and logistic regression models were built to assess factors associated with being knowledgeable of HIV and condom use at last sex.Results: One thousand nine hundred fifty-five participants were interviewed (90% response rate). Less than half (44.7%) had correct knowledge of HIV prevention and 73% used a condom at last sex. Social media use predicted high HIV knowledge as higher odds were observed among participants using the print media (aOR1.87; 1.34-2.60), WhatsApp (aOR1.55; 1.26-1.90), radio/television (aOR2.75; 1.15-6.55) although social networking sites' use protected against knowledge acquisition (aOR0.53; 0.34-0.82). Females (aOR0.75; 0.58-0.97) and participants reporting sexual risk were less likely to have HIV knowledge as negative associations were found for having multiple sexual partners in the last 3 months (aOR0.63;0.48-0.82) and ever having sex (aOR0.37;0.23-0.61). Participants who abused drugs (aOR1.40; 1.05-1.88) and had attitudes accepting people living with HIV (aOR2.05; 1.14-3.69) had higher odds of having HIV knowledge. Females (aOR0.70; 0.54-0.91), students (aOR0.52; 0.40-0.66) and participants who abused drugs (aOR0.58; 0.43-0.77) were less likely to report condom use at last sex.Conclusions: There is a correlation between media use and HIV knowledge, non-condom use and HIV knowledge, and high-risk sexual behaviours and less HIV knowledge. An aggressive community media campaign utilising locally available, preferred and accessible media platforms among young adults is required for behaviour change. [ABSTRACT FROM AUTHOR]