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Can and should anything be done to halt the inexorable rise of the western world's global technology giants such as Amazon, Google and Facebook? Over the past decade we have seen these tech titans come to dominate data collection, cloud computing, retail, social media and publishing, but now there is push-back from anti-monopoly lawyers and sceptical politicians. Stephen Sackur speaks to the American lawyer Lina Khan, who is in the vanguard of the movement to tame big tech. But whose interest is she serving?