This article discusses the problematic process of the remediation of social memory on and through YouTube, focusing on the 1965/66 massacre in Indonesia. Despite being a new media and an arena for contesting vernacular memories of the 1965/66 massacre, YouTube is also often used to advance the State narrative, as seen in how YouTube users replicate the film Penumpasan Pengkhianatan G30S/PKI (The Treachery of G30S/PKI) annually to promote anti-communist agendas, as well as how Indonesian filmmakers title their works that deal with the 1965/66 massacre. More broadly, the monumental memory of 1965/66 on YouTube involves three actors: state actors, film communities, and vigilantes. © 2020 Association Archipel. All rights reserved.