This paper explores the social media literacies of Dakari, a 16-year-old Black teen reader, writer, and activist, within a broader 3-month multi-case study on diverse teens' online literacies. The focus is on Dakari's multimodal literacy practices related to social justice activism and civic engagement. The study highlights how social media platforms empower youth, exemplified by teens like Dakari who utilize these spaces to influence culture, practice critical literacies, and establish civic identities. Examining Dakari's case, three key themes emerge: (1) addressing systemic racism, (2) driving change as a content creator, and (3) challenging the idea that one must wait until adulthood to make a difference. The study highlights the transformative potential of youth of Color's social media literacies, suggesting a reimagining of educators' roles to recognize and respect teens' online literacies while fostering youth identity and political engagement. It is imperative to reshape teaching methods for justice and social change in the digital age. This involves supporting student literacy development and acknowledging the timely language and literacies of youth in social media contexts.