We would like to thank Manoel Horta Ribeiro, Savvas Zannettou, Emiliano De Cristofaro, Gianluca Stringhini and Jeremy Blackburn for a detailed critique of our preprint paper, “Algorithmic Extremism: Examining YouTube’s Rabbit Hole of Radicalization.” Two articles, Ribeiro et al. (2019) paper “Auditing radicalization pathways on YouTube” and Ottoni et al…