At SXSW 2025, Bluesky CEO Jay Graber wore a provocative T-shirt that playfully mocked Mark Zuckerberg, featuring the phrase 'Mundus sine Caesaribus' in Latin. The shirt, reminiscent of Zuckerberg's own controversial attire, sparked excitement among Bluesky users, leading to a quick sell-out of $40 replicas within 30 minutes. Graber's statement emphasizes Bluesky's mission for decentralized power in social media, contrasting sharply with Zuckerberg's Meta. The T-shirt's popularity highlights a growing interest in alternatives to traditional social media platforms.