Social media are a major asset for extremists. Police attempting to prevent and counter extremism cannot leave the online dimension untouched. But what are their options? In this paper, we introduce some approaches that police could use as part of their online contribution to preventing and countering violent extremism online. This paper is written for police  wanting an overview of their online PCVE options, and is based on the RAN POL meeting on ‘The role of police online’ that took place on 1-2 March 2018 in Oslo.