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Facebook's F8 conference - an annual gathering for developers - begins today in San Francisco. It's widely expected that the company will announce a new tool which will utilise chatbots as part of its Facebook Messenger service. It's being hailed as the 'next big thing' for the online world. So will humans be left redundant as the robots take over the world? Comedian and science presenter Steve Mould has some concerns... (Photo: Mobile phone screen showing the Facebook app / Credit: Â鶹Éç Graphics)