Ross Frenett was always fascinated by political extremism. It led him to join the army, to work as a war correspondent, and eventually to co-found Moonshot. Moonshot monitors, analyses and influences extremist behaviour online. It uses digital ad campaigns to present political extremists with an alternative point of view. Frenett talks about life in the internet's sewer, why Ireland's extremists are idiosyncratic, Ireland's responsibility as a hub of the global internet, and how to reach those who have been sucked into conspiracy theories.