Update: Twitter co-founder Jack Dorsey steps down as CEO - a podcast by BBC World Service

Twitter co-founder Jack Dorsey is stepping down as chief executive of the company. Mr Dorsey, who co-founded Twitter in 2006 will be replaced by the current chief technical officer, Parag Agrawal. We ask the Financial Times correspondent Dave Lee why Mr Dorsey has given up the top job. Plus, Peter Jankovskis from Arbor Financial Services also brings us the latest news from the US markets.

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