Elon Musk, CEO of Tesla and owner of Twitter, has suggested Las Vegas as the location for a "cage match" between himself and Facebook co-founder Mark Zuckerberg. The exchange began with a tweet about Facebook's reported plans to create a Twitter rival, prompting Musk to suggest the social media site would leave the earth "exclusively under Zuck's thumb". After a user suggested Zuckerberg was trained in jiu-jitsu, Musk joked that he was "up for a cage match if he is".