SAQIB QURESHI The world has already learned the hard way that digital media - and especially social media - can weaken societies and undermine our systems of government. We are repeating the same mistakes with ‘deep fake technology, as it becomes more readily available, cheaper, and better.  We must act now to create effective laws and policies against deepfakes before they are used against us - just as social media was in the Cambridge Analytica scandal, where Facebook users' data was mined by now-defunct firm Cambridge Analytica to assist both Trump's 2016 presidential campaign and the Leave campaign in Britain.…