Billionaire Elon Musk stood out in appearance and rhetoric at a summit featuring some of the world's most powerful figures in politics, business and entertainment.

In a profanity-laced outburst, Elon Musk has slammed advertisers that have left X, warning they will kill the social media platform. At an event in New York, he accused companies that have joined an ad boycott of the site formerly known as Twitter of trying to blackmail him.

At the New York Times DealBook summit, Elon Musk was asked about American firms - including Disney - who pulled ads after he apparently endorsed an antisemitic conspiracy theory. In the on-stage interview,