"Is it time for me to be authentic?": Understanding, performing, and evaluating authenticity on BeReal

On social media, people often value authenticity and realness, yet the ways in which platforms promote authenticity may conflict with people's goals to present an idealized self. Launched in 2020, the social media app BeReal encourages authenticity by prompting users to post unfiltered front and back camera photos at a particular time, thereby limiting control over their online self-presentation. We interviewed 25 BeReal users, exploring how they understand, perform, and evaluate authenticity given these unique constraints. Our findings reveal that participants resist BeReal's prompts and encouragements, employing strategies to regain control over their self-presentation. Yet participants simultaneously ascribe to BeReal's notion of realness, believing posts should appear effortless, branding themselves and others as fake when they ignore BeReal's prompts. Ultimately, we discuss authenticity as sociotechnical and reflect on the ways in which people's values around authenticity shift over time.