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All the time spent on social media - clicking, chatting and scrolling - doesn't match the way we would choose to spend our time if we set our own goals, according to a former Google strategist. James Williams, who has written 'Stand Out of Our Light: Freedom and Resistance in the Attention Economy', says the liberation of human attention from the clutches of tech may be the defining political and moral struggle of our time. (Image: Messaging apps; Credit: AFP/Getty Images)