This article investigates the complex rhetorics of racial authenticity online, intermixing ethnography and critical technocultural discourse analysis (CTDA) to understand African American users’ investments in enacting race in their social networks. The piece uncovers “acting white” as a significant discourse that shapes online identity and group performances. Examining rhetorics of racial authenticity including insider knowledges in relation to “acting white” and “acting black,” I map Twitter users’ negotiations with individual and collective notions of racial ingroup markers. I put forth the finding of “performance in the negative case,” as interviewees discuss their lack of participation in their ingroup based on diverse perceptions of racial authenticity. I argue that a full understanding of racial authenticity, performative participation, and nonresponsiveness opens up identity and race formulations to include complexities of what is and is not expressed via interaction and performance.