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The Western Balkans faces a double challenge from online extremism. Online platforms are facilitating the specific targeting of the region by diverse international extremist narratives. Meanwhile regional histories and geopolitics are being appropriated to justify extremist actions and narratives around the world. This is part of a wider trend that underscores the growing challenge posed by the proliferation of transnational extremist ideologies on online platforms, both violent jihadist and extreme right wing. In the Western Balkans, this poses a number of specific risks. While the issue of the prevention, mitigation, and regulation of online extremism is a global one, there are a number of region-specific considerations relevant to effective policy and practitioner responses.

This article reviews the academic literature on how and for what purposes violent extremists use the Internet, at both an individual and organizational level. After defining key concepts like extremism, cyber-terrorism and online radicalization, it provides an overview of the virtual extremist landscape, tracking its evolution from static websites and password-protected forums to mainstream social media and encrypted messaging apps. The reasons why violent extremist organizations use online tools are identified and evaluated, touching on propaganda, recruitment, logistics, funding, and hacking. After this, the article turns to the ways violent extremist individuals use the Internet, discussing its role as a facilitator for socialization and learning. The review concludes by considering the emergent literature on how violent extremism is being countered online, touching on both defensive and offensive measures.

VOX-Pol Blog post.

VOX-Pol Blog post.

VOX-Pol Blog Post.

A better understanding of how support evolves online for undesirable behaviors such as extremism and hate, could help mitigate future harms. Here we show how the highly irregular growth curves of groups supporting two high-profile extremism movements, can be accurately described if we generalize existing gelation models to account for the facts that the number of potential recruits is timedependent and humans are heterogeneous. This leads to a novel generalized Burgers equation that describes these groups’ temporal evolution, and predicts a critical influx rate for potential recruits beyond which such groups will not form. Our findings offer a new approach to managing undesirable groups online – and more broadly, managing the sudden appearance and growth of large macroscopic aggregates in a complex system – by manipulating their onset and engineering their growth curves.