Algorithms know a lot more about us than we know about them. The algorithm is a lot more than just predicting things we want to see and hear online, and the general public knows almost nothing about them, and even less about the engineers and coders who are creating them behind the scenes. Gwen Lister and co-founder of AlgorithmWatch, Lorenz Matzat, shed light on the characteristics and effects of complex algorithmic decision-making processes on the general public.