When talking about the internet, we like to assume it is a powerful utility that enhances democracy. But instead of improving our understanding and informing our political choices, social networks and social media actually narrows the debate and closes down free speech. Electorates across the world are being manipulated by tech monopolies that are collating our data and using it to appeal to our prejudices. In short, digital is killing democracy. We went to the Netherlands to meet André Krouwel, a political scientist who thinks differently about the power and influence of social media.