This article investigates the performance of Pacific identities on Twitter during a high-profile cultural and sporting event, Tonga and Australia’s first-ever rugby league test match in late 2018. More than 9000 tweets were analysed using quantititative and qualitative methods to map different publics orienting to the event on Twitter, including a Pacific diasporic public that emerged through locative practices of identity and cultural performance. This study finds that Pacific users’ tweets were differentiated by textual and visual cues, including the use of emojis as a paralanguage of Pacificness and a racialized visual discourse of ‘Brownness’, in ways that suggest an emerging Pacific counter-public. The findings discussed here further demonstrate the ways in which social media affordances enable the construction of race and ethnicity online, and the ways in which marginalised groups are using social media to create alternative public spheres. This study also demonstrates the importance of looking more closely at the different discursive practices within Twitter publics to both foreground marginalised groups’ practice and de-Westernise social media studies.