Mark Zuckerberg

"Let's do this. Welcome to Threads," Zuckerberg wrote in his first post on the app, along with a fire emoji. He said the app logged 5 million sign-ups in its first four hours.

The same day, Musk tweeted "some chance fight happens in Colosseum" while also sharing a clip of a Colosseum fight from the film Life of Brian.

Elon Musk seemed to enjoy his training sessions, commenting, "That was fun!" on the photos shared of his workout.

Twitter owner Musk tweeted on Tuesday he was up for a cage match in Las Vegas with Zuckerberg, CEO of Facebook parent Meta META.O, who has trained in jiu-jitsu.

Elon Musk challenged Mark Zuckerberg to a fight after someone tweeted claiming that Meta is developing a Twitter rival called Threads.

The model, I-JEPA, uses background knowledge about the world to fill in missing pieces of images, rather than looking only at nearby pixels like other generative AI models, the company said.

The SAM model and dataset will be available for download under a non-commercial license. Users uploading their own images to an accompanying prototype.

Meta separately faces hundreds of lawsuits from families of teenagers and younger children who claimed to suffer mental health problems by becoming addicted to Facebook and Instagram.

Worries of an economic downturn due to rising interest rates have sparked a series of mass job cuts across corporate America.

The social media platform launched a chat service that lets creators easily update their followers, just like on Telegram.