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This study examined how privacy literacy and privacy perceptions on social networking sites are associated with youth posting about alcohol, marijuana and sexual activity online. Facebook and Snapchat users age 16 to 25 (n=266) were surveyed about how often they and their friends post risky health behaviors on each platform, their perceptions of privacy, and their privacy literacy. The findings suggest that privacy literacy was associated with decreased marijuana and sexual activity posting on Facebook, but increased alcohol posting on Snapchat. Privacy perceptions were not associated with posting risky behavior on each platform. Respondents reported their friends post risky behaviors nearly twice as frequently as they do themselves. These findings highlight the concept of privacy literacy and its association with youth’s display of risky behaviors and contributes to our understanding of how youth social media behavior relates to notions of privacy and peer online behavior.