Purpose: Social media offers youth a virtual platform to build community and amplify underrepresented voices. Online spaces are often used to respond to societal issues and adopt various roles. This article aims to focus on Laura's case, spotlighting the intersection of online activism by a youth of Color, and social media literacies used to demonstrate civic engagement around contemporary social justice issues. Design/methodology/approach: Through case study methods, the author examined how a youth of Color used social media to employ critical literacy practices as tools for civic engagement, advocating for social justice, and navigating the complexities of identity work in online spaces, spotlighting Laura, a self-identified Mexican and Ecuadorian Latine 18-year-old activist, to understand how social media shapes multimodal literacy practices, how youth build culture, engage in literacies and craft civic identities online. Findings: Findings examine Laura's social media literacies toward social justice activism, contributing to the understanding of youth activism, digital identity and civic engagement. Findings will also examine how Laura enacts online literacy practices related to her racialized identities, and how she engages in activism and civic participation related to social justice issues. These findings contribute to the understanding of youth activism, digital identity and civic engagement. Originality/value: This paper focuses on Laura's practices within the larger frame of politics, digital space and youth culture. Moreover, it also highlights the potential of youths' multifaceted social media literacies to redefine the educator's role by fostering youth identity and social justice literacies.