In recent years, have the focus on Incels increased due to various deadly attacks that have been associated with extreme misogynistic content. This study aims to discuss current online prevention methods’ applicability with respect to Incels and to comprehend if online prevention methods can mitigate future attacks in Nordic countries. To provide knowledge of current online prevention methods a systematic literature review in accordance with the PRISMA was conducted. Several databases e.g., Google Scholar and PsycINFO were searched for articles published in peer-reviewed international journals. Ten articles which included online moderation measures regarding extremist content and Incels were admitted. Additionally, a non-systematic review was conducted in relation to reports regarding Incels published by Nordic organizations. Four reports were found. The Routine Activity Theory was then applied to the results from the papers found in the systematic and the non-systematic review. One limitation of the review is that only a few articles have been included which makes generalizability difficult. Numerous methods can be applied regarding Incels when it comes to online prevention measures. However, current methods seem to consist of a duplexity, where the moderation methods influence different SoMe platforms, but also create echo chambers on encrypted platforms where an increase of Incel radicalization materializes. To mitigate future attacks the use of proactive online prevention methods, e.g., detection tools and connectivity tools should be used by different platforms and law enforcement, as the capable guardian, to allocate imminent threats from Incels.