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In the recent past, the numbers of religiously- and politically-motivated terrorist attacks have increased, inevitably raising the question of effective measures to prevent further terrorist attacks. Empirical studies related to school shootings have shown that school shooters reliably (directly and indirectly) disclosed their intentions or plans prior to the attack, a phenomenon termed leaking or leakage. Leaking has been used for preventive purposes in this area of research. Recent research has indicated that leaking was also present prior to politically and religiously motivated terrorist attacks. In order to determine the current state of knowledge about leaking related to these offenses, we conducted a review of the international literature on religiously and politically motivated terrorist attacks. Up to 90% of the offenders showed some type of leaking prior to the attacks. A range of different forms of leaking could be observed. Leaking often occurred in the form of verbal communication with family and friends and/or via communication over the Internet. Terrorist offenders apparently tend to show leaking more often than other groups of mass murderers. Findings regarding similarities and dissimilarities in leaking between religiously motivated, jihadist and politically-motivated, far-right terrorist attacks were contradictory. We discuss the implications of these findings for practice and research as well as the strengths and possible weaknesses of the leaking concept.

This study explores how an extreme far-right alternative media site uses content from pro-fessional media to convey uncivil news with an antisemitic message. Analytically, it rests on a critical discourse analysis of 231 news items, originating from established national and international news sources, published on Frihetskamp from 2011–2018. In the study, we explore how news items are recontextualised to portray both overt and covert antisemitic discourses, and we identify four antisemitic representations that are reinforced through the selection and adjustment of news: Jews as powerful, as intolerant and anti-liberal, as exploiters of victimhood, and as inferior. These conspiratorial and exclusionary ideas, also known from historical Nazi propaganda, are thus reproduced by linking them to con-temporary societal and political contexts and the current news agenda. We argue that this kind of recontextualised, uncivil news can be difficult to detect in a digital public sphere.

The ever-increasing amount of user-generated content online has led, in recent years, to an expansion in research and investment in automated content analysis tools. Scrutiny of automated content analysis has accelerated during the COVID-19 pandemic, as social networking services have placed a greater reliance on these tools due to concerns about health risks to their moderation staff from in-person work. At the same time, there are important policy debates around the world about how to improve content moderation while protecting free expression and privacy. In order to advance these debates, we need to understand the potential role of automated content analysis tools.

This paper explains the capabilities and limitations of tools for analyzing online multimedia content and highlights the potential risks of using these tools at scale without accounting for their limitations. It focuses on two main categories of tools: matching models and computer prediction models. Matching models include cryptographic and perceptual hashing, which compare user-generated content with existing and known content. Predictive models (including computer vision and computer audition) are machine learning techniques that aim to identify characteristics of new or previously unknown content.

The polarizing tendency of politically leaned social media is usually claimed to be spontaneous, or a by-product of underlying platform algorithms. This contribution revisits both claims by articulating the digital world of social media and rules derived from capitalist accumulation in the post-Fordist age, from a transdisciplinary perspective articulating the human and exact sciences. Behind claims of individual freedom, there is a rigid pyramidal hierarchy of power heavily using military techniques developed in the late years of the cold war, namely Russia Reflexive Control and the Boyd’s decision cycle in the USA. This hierarchy is not the old-style “command-and-control” from Fordist times, but an “emergent” one, whereby individual agents respond to informational stimuli, coordinated to move as a swarm. Such a post-Fordist organizational structure resembles guerrilla warfare. In this new world, it is the far right who plays the revolutionaries by deploying avant-garde guerrilla methods, while the so-called left paradoxically appears as conservatives defending the existing structure of exploitation. Although the tactical goal is unclear, the strategic objective of far-right guerrillas is to hold on to power and benefit particular groups to accumulate more capital. We draw examples from the Brazilian far right to support our claims.

Some moderation strategies of online content have targeted the individuals believed to be the most influential in the diffusion of such material, while others have focused on censorship of the content itself. Few approaches consider these two aspects simultaneously. The present study addresses this gap by showing how a socio-semantic network analysis can help identify individuals and subgroups who are strategically positioned in radical networks and whose comments encourage the use of violence. It also made it possible to identify the individuals and subgroups who act as intermediaries and whose statements are often the most violent.

Disrupting the emergence and evolution of potentially violent online extremist movements is a crucial challenge. Extremism research has analyzed such movements in detail, focusing on individual- and movement-level characteristics. But are there system-level commonalities in the ways these movements emerge and grow? Here we compare the growth of the Boogaloos, a new and increasingly prominent U.S. extremist movement, to the growth of online support for ISIS, a militant, terrorist organization based in the Middle East that follows a radical version of Islam. We show that the early dynamics of these two online movements follow the same mathematical order despite their stark ideological, geographical, and cultural differences. The evolution of both movements, across scales, follows a single shockwave equation that accounts for heterogeneity in online interactions. These scientific properties suggest specific policies to address online extremism and radicalization. We show how actions by social media platforms could disrupt the onset and ‘flatten the curve’ of such online extremism by nudging its collective chemistry. Our results provide a system-level understanding of the emergence of extremist movements that yields fresh insight into their evolution and possible interventions to limit their growth.