Twitter co-founder Jack Dorsey steps down as CEO

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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. The Financial Times San Francisco correspondent Dave Lee tells us why Mr Dorsey has given up his job. Also, countries including Japan have shut their borders over Omicron Covid variant fears. We explore to what extent travel restrictions work in preventing the spread of viruses with Keith Neal, emeritus professor of epidemiology and infectious diseases at the University of Nottingham. And we get a sense of the likely economic impact of restrictions on South Africa from George Glynos, who is head of research at ETM Analytics. Later in the programme, an episode of cartoon The Simpsons which refers to Tiananmen Square does not appear on the Disney+ video streaming platform in Hong Kong. Tom Grundy is editor in chief of the Hong Kong Free Press and explains the background. Plus, labour shortages plaguing many companies around the world appear to extend all the way to the North Pole. The BBC's Samira Hussain in New York reports on a shortage of Santas this festive season. (Picture: Jack Dorsey, co-founder of Twitter. Picture credit: Getty Images.)