Bluesky CEO Trolls Mark Zuckerberg at SXSW With Latin Shirt - Business Insider

Mar 12, 2025

Bluesky's CEO took the stage at SXSW this week, but her message wasn't just in what she said. It was also in what she wore.

Jay Graber wore a black T-shirt that read "Mundus sine caesaribus," which is Latin for "a world without Caesars." The statement piece is seemingly a dig at Mark Zuckerberg.

The Meta CEO has taken to wearing T-shirts with Latin or Greek phrases on them in recent years amid his broader style evolution.

At his 40th birthday party last year, he wore a shirt saying "Carthago delenda est," which means "Carthage must be destroyed." The phrase, attributed to Roman historian Cato the Elder, was a rallying cry for Facebook in 2016 in its competition with Google.

At a live taping of the "Acquired" podcast in September, he donned a shirt he designed that said "learning through suffering" in Greek.

And Zuckerberg compared himself to the Roman dictator Julius Caesar with a shirt he wore at Meta's Connect developer conference last year. It read "Aut Zuck aut nihil," a riff on the phrase "Aut Caesar aut nihil," which translates to "Either Caesar or nothing."

Graber's shirt appears to send a message on how she feels about Zuck's antics.

Bluesky is an open-source alternative to social platforms like Meta's Facebook and Threads and Elon Musk's X, which is formerly known as Twitter.

Since Trump was elected as president, Meta has made some significant changes to its platform, including replacing third-party fact-checking with community notes.

Following the election, Bluesky also saw a surge in new users.

Jack Dorsey, the co-founder of Twitter and Bluesky, said in a recent episode of the "In Good Company" podcast that he thinks "people are running away from X, rather than running to something on Bluesky."

Bluesky was created in 2019 as an internal project at Twitter, where Dorsey was still CEO. Two years later, it launched as a stand-alone public benefit corporation.

Its platform officially launched in February 2024 with around 3 million users and grew to 25.9 million users by the end of the year.

Meta and Bluesky did not immediately respond to a request for comment.