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Remember the time when the internet was trumpeted as the tech tool that would deliver us a golden age of knowledge, freedom and democracy? Now we're in a darker, more cynical place. The digital revolution has generated fears about lost privacy, mass surveillance and systemic misinformation. Have the corporate titans of tech failed us?

Stephen Sackur speaks to president of Microsoft Brad Smith. How do we ensure our astonishing technological advances are harnessed for good, not harm?