This week: Elon Musk enters AI race with xAI, ARK writes down its stake in Twitter...

Another dicey week for some big names in the tech industry. In the latest episode of the Elon Musk experience, the billionaire announced the launch of xAI. The start-up, whose staff includes Google Deepmind and OpenAI alumni, intends “to understand the true nature of the universe.” Reports of ARK reducing its stake in Twitter by 47%, however, may have brought the Tesla-boss back down to Earth with a bump.

Meta, meanwhile, contended with Norwegian authorities, who threatened to fine the Facebook-parent daily unless it remedied privacy breaches. With news that the company's Twitter-rival Threads also saw users halve just one week after launch, could Zuckerberg have had a worse week than Musk?

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