At SXSW 2025, Bluesky CEO Jay Graber made a quiet but playful statement—not just through her words but also through what she wore. Graber took the stage in a simple black T-shirt in what seemed to be a familiar pattern among women leaders in tech by dressing down to be taken seriously. But this was far more intentional.
The shirt bore a Latin phrase: “Mundus sine caesaribus,” meaning “a world without Caesars.” It was a direct counter to Mark Zuckerberg’s own shirt, which recently made headlines for its phrase, “Aut Zuck aut nihil” — a twist on the traditional “Aut Caesar aut nihil” (“Either Caesar or nothing”). Zuckerberg’s shirt, and his comparisons of himself to Julius Caesar, seem to embody the centralized control that Bluesky aims to dismantle.
Graber’s message, both symbolic and structural, is clear. Bluesky is building a decentralized, open-source social network that gives users more power and transparency compared to platforms like Facebook.
Graber said during her keynote:
If a billionaire came in and bought Bluesky, or took it over… people could fork off and go on to another application. There are already applications in the network that give you another way to view it, or you could build a new one as well.
The design of Bluesky’s network ensures that no single person—no “Caesar”—can seize full control. For Graber, it’s not just a shirt. It’s a philosophy baked into the platform’s very foundation.