Talk given at the workshop 'How Can Public Interest Journalism Hold Algorithms to Account?' at the University of Cambridge on 23 March 2017. More about the talk can be found here: http://lilianabounegru.org/2017/03/27/fake-news-algorithmic-accountability-data-journalism-post-truth-university-of-cambridge/ More about the workshop can be found here: http://www.crassh.cam.ac.uk/events/27130