This article examines the phenomenon of epistemic injustice within the global social media landscape, using Southeast Asia as a case study. It explores how X (formerly known as Twitter) holds the potential to cultivate a digital public sphere that embodies justice and equitable dialogue, compared with major platforms like Facebook, Instagram, and TikTok. Beginning with an introduction to epistemic injustice, the article contextualizes its significance in Southeast Asia, highlighting the region’s digital challenges and opportunities. It then proposes characteristics necessary for ideal social media platforms, drawing on Habermas’s public sphere and Rawls’s justice principles to advocate for spaces that promote inclusive and rational discourse. The core analysis centers on X, suggesting that its features could make it a superior choice for fostering a just digital environment globally. The article recommends specific improvements for X to evolve into an ideal social platform, addressing challenges such as cyberbullying, echo chambers, and misinformation. The conclusion emphasizes the importance of prioritizing epistemic justice in social media platforms to achieve a more inclusive and fairer digital public sphere, with Southeast Asia serving as a representative example of a less-than-ideal environment where such platforms could thrive.