The use of social media is now an important component in the spread of radicalism in Indonesia, and this is reinforced by the increasing use of the internet in the country. The aim of this study is to look at how Indonesia's criminal law controls the spread of extremism and investigate social media-based initiatives to do so. In addition, developing ideas for criminal strategies to stop the radicalization of Indonesian society through social media. According to research findings, Indonesia's positive law is not sufficient to address restrictions on the spread of radicalism through social media. In Indonesia, efforts to stop radicalization on social media are currently concentrated on criminal law. The three pillars of overcoming radicalism through social media in Indonesia are supervision, action, and collaboration between platforms and the community. These pillars constitute the basis of the criminal policy concept to counter the propagation of radicalism carried out through social media. Of course, the action taken goes beyond merely removing offensive content from social media and includes a review of the culprits' level of radicalization.