Bluesky CEO Jay Graber called out Mark Zuckerberg without even uttering the social media mogul’s name during an appearance at South by Southwest. Graber arrived at her keynote discussion during the Austin,

PM EDT All sizes of Bluesky's "A WORLD WITHOUT CAESARS" shirt sold out in less than 30 minutes. We've asked the company whether it's planning a restock and will update this story if/when we hear back.

Bluesky CEO Jay Graber sparked online speculation at SXSW by wearing a T-shirt that read "A world without Caesars," a possible subtle jab at Meta's Mark Zuckerberg and his penchant for Roman-themed slogans,