After Elon Musk recently tweeted that he would be “up for a cage fight” with Zuckerberg, the Meta CEO shot back by posting a screenshot of Musk’s tweet with the caption “send me location. ”I’ve confirmed that Zuckerberg’s post on his Instagram account is, in fact, not a joke, which means the ball is now in Musk’s court. ”I’ve confirmed that Zuckerberg’s post on his Instagram account is, in fact, not a joke, which means the ball is now in Musk’s court