Elon Musk and Mark Zuckerberg say they're ready for a cage fight

In an Instagram story on Wednesday (Thursday morning AEST), Zuckerberg fired back by posting a screenshot of Musk’s tweet overlaid with the caption “Send Me Location”.

“I have this great move that I call ‘The Walrus,’ where I just lie on top of my opponent & do nothing,” he added in a separate tweet.

CNN has contacted Meta for comment. A spokesperson for the company told Verge: “The [Instagram] story speaks for itself.”

It remains unclear whether Zuckerberg and Musk are serious or having a laugh.

Musk had repeatedly warned about the dangers of AI, describing it as a potentially existential threat to the human race. Zuckerberg, on the other hand, took a much more optimistic view.

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During a Facebook Live broadcast at the time he dismissed “naysayers” who sketched out “doomsday scenarios” as being “pretty irresponsible”.

Musk shot back shortly afterward, tweeting: “I’ve talked to Mark about this. His understanding of the subject is pretty limited.”

Musk knocked Zuckerberg from the number three spot on the Bloomberg Billionaires Index in 2020, before becoming the richest person in the world soon after that.

Quite who would win in a cage fight remains to be seen. Musk is physically bigger than Zuckerberg, but the Meta chief practices jiu-jitsu, the Brazilian martial art, and won gold and silver in a tournament in May.