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The advent of social media platforms has created an online environment that transcends geographic and political boundaries as well as traditional mechanisms of state-based authority. The decentralised nature of social media and its ability to disseminate content anonymously and to reach wide audiences has afforded violent extremist groups opportunities to further propaganda, recruitment, radicalisation, fundraising and operational planning. This paper examines three violent extremist-related groups operating in Asia Pacific: one ‘classic’ terrorist – Abu Sayyaf in the Philippines; one a dissident political party – Jamaat-e-Islami in Bangladesh; and one a broad ethno-religious separatist movement – the Uyghurs in China. Each study highlights how the adoption of proactive social media strategies affords the group numerous opportunities to maximise their reach, impact and effect. However, the same technological specificities that generate these possibilities also expose the groups to new vulnerabilities and risks.

Recent decades have seen a blurring of the line between extremist movements and mainstream politics, driven by rising sectarian polarization. This development has been linked to digital media, with suggestions that so-called echo chambers may drive political radicalization. To understand the social processes taking place inside such digital spaces, this article draws on Randall Collins and the Durkheimian tradition to develop a theory of discursive community formation. Empirically, we analyze 20 years of discussion on the White Power forum Stormfront, employing natural language processing to study discursive evolution as members become socialized into the community. Our findings suggest that digital media provide space for conversational rituals that instill in people a sense of social membership and intersubjectivity, contained in the elaboration of a shared discourse, within which certain beliefs become sacred and unquestionable. This provides a potential social mechanism linking echo chambers to the rise of sectarian polarization.

The journey inside Facebook’s semiosphere revolves around the present-day controversy on how algorithms foster polarization and discord in one of the biggest and most popular social media platforms, namely, Facebook. The present work focuses on the so-called Facebook Files as a specific case study. By drawing on these investigations, the present study discusses what are the principles used by the Facebook algorithms in order to select a certain type of content and to direct attention to it, whilst generally discarding other types of content considered not enough engaging. By drawing on the perspective of the semiotics of culture, this paper makes an analogy between Ju. Lotman’s model of the “semiosphere” and the Facebook’s digital semiosphere with the goal of unpacking how the selection, diffusion, and suppression of online content is geared towards the polarization of ideas.

The English Defence League (EDL) is the biggest populist street movement in a generation. Yet the make-up of the group and what its members believe remain a mystery because it has no formal joining procedures or membership list and much of its activity takes place online. The collection of large amounts of data from social media presents new opportunities for social research to understand the relationship between off- and online activity. As more movements combine – and blur – virtual and real protest, these questions will become increasingly urgent and important. These surveys, collected through Facebook using a new methodology, offer new ways forward in exploring this challenge.

This Element aims to better understand the role of the internet in the radicalization process, focusing on how online factors contribute to self-radicalization. Specifically, it examines the neurocognitive process of online radicalization by analyzing the impact of terrorist and extremist propaganda videos on individuals’ cognitive empathy using electroencephalography (EEG). Ultimately, this research aims to provide a more comprehensive understanding of online radicalization and the psychological effects of exposure to extremist content on the internet.

This case study explores the convergence of white extremist political ideology with mainstream political ideology on the micro-blogging platform Twitter – a phenomenon termed “inter-ideological mingling”. Exploring the spread of white extremism in the digital environment can provide insight into the growth of hate groups in the physical environment. A sample of 4800 tweets was examined through hierarchical cluster analysis and textual analysis. Several pieces of evidence were found supporting inter-ideological mingling. Cluster analysis shows that extremist terms are not isolated from terms found in mainstream political discourse. Textual analysis of individual tweets provides evidence for five strategies of inter-ideological mingling: joining, blending, piggybacking, backstaging, and narrating.