Meta CEO Mark Zuckerberg mocked billionaire Elon Musk for saying over the weekend that their anticipated cage match will be streamed live on X, formerly known as Twitter.

Zuckerberg took a shot at Musk on Threads, Meta’s new competitor to X, a couple of hours after the Tesla owner’s Sunday announcement.

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“Shouldn’t we use a more reliable platform that can actually raise money for charity?” Zuckerberg wrote.

Earlier on Sunday, Musk said X will host the fight and that all proceeds from the event “will go to charity for veterans.” He also said he is “preparing for the fight” during his work week. Zuckerberg himself has also been staying in shape ahead of the fight, announcing he had earned a blue belt in Brazilian jiu-jitsu last month while training with his coach.

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In June, the two Big Tech billionaires agreed to fight each other in a cage match, although Zuckerberg was initially unsure whether the fight would happen at all. On Sunday evening, Musk said he was “getting an MRI of my neck & upper back” on Monday and “will know this week” whether he can rise to the challenge.

There is no confirmed date for the fight at this time.