This edited collection tackles subjects such as what is wrong with targeted advertising in political campaigns and are echo chambers really a matter of genuine concern? Also examined are the impact of data collection on questions of trust in society and the problem of opacity: as decision-making becomes increasingly automated so it will become harder to hold decision-makers accountable. The contributors consider potential solutions to these challenges and discuss whether an ethical compass is available or even feasible in an ever more digitised and monitored world.The editors bring together original research on the philosophy of big data and democracy from leading international authors, along with recent examples and case references (including the 2016 Brexit referendum, the Leveson Inquiry and the Edward Snowden leaks), and combine them in one authoritative volume at a time of great political turmoil.