Who is watching you?

Society is at a turning point, warns Professor Shoshana Zuboff. Democracy and liberty are under threat as capitalism and the digital revolution combine forces. She tells Andrew Marr how new technologies are not only mining our minds for data, but radically changing them in the process. As Facebook celebrates its 15th birthday she examines what happens when a few companies have unprecedented power and little democratic oversight. Although behavioural data is constantly being abstracted by tech companies, John Thornhill, Innovations Editor at the Financial Times, questions whether they have yet worked out how to use it effectively to manipulate people. And he argues that the technological revolution has brought many innovations which have benefitted society.The award-winning writer Ece Temelkuran has warned readers about rising authoritarianism in her native Turkey. In her new book, How To Lose a Country, she widens that warning to the rest of the world. She argues that right-wing populism and nationalism do not appear already fully-formed in government - but creep insidiously in the shadows, unchallenged and underestimated until too late.Producer: Katy Hickman