Big tech is facing a big moment. With plummeting stock prices, and mass lay-offs, the likes of Google, Twitter and Meta are all - for different reasons - facing some tough questions over how they're being run.

Some see this as primarily a result of post-pandemic blues, the rise in interest rates, and a general cost-of-living crisis affecting the business environment. However, Twitter and Meta especially have seen wholesale desertions by a number of major advertisers, worried about the regulation of hate speech, and therefore by association the safety of brands' reputations.

Does this mark a deeper crisis for the ad-based business model of the major social media platforms? And what can they do about it?

Presenter / Producer: Ed Butler