This article presents the critical digital literacy practices of Latinx bilingual youth in the United States enrolled in a secondary ethnic studies course. Despite the expansion of digital tools in classrooms, empirical studies on the pedagogical affordances of such tools, and how they enhance youth's critical digital literacies and understandings of themselves remain scarce. The author relies on participant observation, interviews, and the analysis of writing within a unit that incorporated students' twenty-first century language and literacy practices via Vine's social media platform to explore issues of power and privilege within an exacerbated sociopolitical climate. Findings reveal the ways in which students drew on a range of fluid linguistic and literate practices to make meaning of themselves, problematize oppressive dominant discourses, and negotiate more desired identities and literacies. Attention to young people's translanguaging and multimodal codemeshing practices on social media platforms can harvest critical insight about what constitutes twenty-first century critical digital literacies.