This item was first produced for the BBC World Service
Turbulent times ahead for tech firms
Twitter has hit troubled times since it was taken over by Elon Musk Source: Getty / SOPA Images/SOPA Images/LightRocket
Some tech firms are facing plummeting stock prices, and mass lay-offs. It's partly down to falling advertising revenue. Concerns over the micro-blogging site Twitter - recently bought by billionaire Elon Musk - are at the forefront of many industry observers' minds
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