Mark Zuckerberg and Elon Musk are two of the most influential and controversial figures in the tech industry. They have been involved in a long-running feud over various topics, such as artificial intelligence, social media, and space exploration. They have also challenged each other to a cage fight, which has generated a lot of media attention and speculation. However, the fight seems unlikely to happen, as Zuckerberg has accused Musk of not being serious and has said he wants to focus on competing with people who take the sport seriously.