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Far-right and involuntary celibate extremists are said to populate an “online extremist ecosystem” of digital media environments. Online violent extremists are said to use this “ecosystem” to access outcomes that were previously unattainable. Yet there remained fundamental knowledge gaps in understanding the advantageous and limits of using ecosystems to understand and address far-right and involuntary celibate online violent extremism. This foundational theoretical and empirical study critically assessed whether ecosystems offered a greater or lesser understanding of these communities in the Australian and Canadian context and examined how individual involvement in these communities is shaped by digital media software and hardware.

The issue of radicalization has drawn significant attention over the last decade, as high-profile mobilizations and far-right violence grow increasingly prevalent in the United States. This has been accompanied by a particular interest in radicalization in the online context, as far-right recruitment and organizing increasingly leverages the affordances of digital platforms. In this dissertation, I advance theoretical understandings of online radicalization processes by analyzing differential participation within one growing and under-examined segment of the far-right: secular male supremacist movements. Based on prior literature identifying increasing extremism in these spaces, and increasing instances of users moving between distinct but related communities, I address two specific research questions: 1) what individual and community-level factors drive differences in engagement in male supremacist communities; and 2) what individual and community-level factors predict user migration to more extreme male supremacist communities?