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The theory of echo chambers, which suggests that online political discussions take place in conditions of ideological homogeneity, has recently gained popularity as an explanation for patterns of political polarization and radicalization observed in many democratic countries. However, while micro-level experimental work has shown evidence that individuals may gravitate towards information that supports their beliefs, recent macro-level studies have cast doubt on whether this tendency generates echo chambers in practice, instead suggesting that cross-cutting exposures are a common feature of digital life. In this article, we offer an explanation for these diverging results. Building on cognitive dissonance theory, and making use of observational trace data taken from an online white nationalist website, we explore how individuals in an ideological ‘echo chamber’ engage with opposing viewpoints. We show that this type of exposure, far from being detrimental to radical online discussions, is actually a core feature of such spaces that encourages people to stay engaged. The most common ‘echoes’ in this echo chamber are in fact the sound of opposing viewpoints being undermined and marginalized. Hence echo chambers exist not only in spite of but thanks to the unifying presence of oppositional viewpoints. We conclude with reflections on policy implications of our study for those seeking to promote a more moderate political internet.

The increasing pervasiveness of social media has been matched by growing concerns regarding their potential impact on democracy and public debate. While some theorists have claimed that ICTs and social media would bring about a new independent public sphere and increase exposure to political divergence, others have warned that they would lead to polarization, through the formation of echo chambers. The issue of social media echo chambers is both crucial and widely debated. This article attempts to provide a comprehensive account of the scientific literature on this issue, highlighting the different approaches, their similarities, differences, benefits and drawbacks, and offering a consolidated and critical perspective that can hopefully support future research in this area. Concretely, it presents the results of a systematic review of 55 studies investigating the existence of echo chambers on social media, identifying patterns across their foci, methods and findings, and shedding light on the contradictory nature of the literature. We found that the results of research on this issue seem largely influenced by methodological and data collection choices. Indeed, articles that found clear evidence of echo chambers on social media were all based on digital trace data, while those that found no evidence were all based on self-reported data. Future studies should take into account the potential biases of the different approaches and the significant potential of combining self-reported data with digital trace data.

Expressions of ‘eco-fascism’ are said to entail ethnonationalist actors advocating extreme population control measures, and accelerationists hastening the collapse of societies worldwide. These expressions emerge from political-ideological environments in which Global North actors have erroneously assigned blame for climate change with the Global South, through rhetoric about migration, population control and fossil fuel usage. To assess the influence of these themes in the development of eco-fascist ideologies online, this paper presents insights from a mixed-methods analysis of climate change discussions on Stormfront; the first dedicated online white nationalist media platform still drawing cross-national participation and viewership from generalized public audiences.

With Patrick Crusuis’ 2019 attack that killed twenty-two people in El Paso, Texas, discussions of ecofascism were thrust into mainstream news outlets and magazines. In his manifesto, Crusius described himself as an “ecofascist” seeking to challenge the “environmental warfare” of immigration. His choice of target, a Walmart frequented by Mexican immigrants, reflects this ideological connection between ecological priorities and violent white supremacist ideology. In this paper, the authors provide a review of existing theoretical literature on ecofascism to identify its key characteristics, namely, its Romantic sensibilities, anti-humanism, and mysticism. The authors argue that these features distinguish ecofascism from what other scholars have deemed “far-right ecologisms.” Following this, the authors draw on a larger corpus of data gathered from Twitter and Telegram between November 2019 and November 2020 to identify common themes in ecofascist circles, including the thinkers they frequently cite. The dataset examined shows notable differences in the types of content shared in ecofascist groups compared to the far-right more broadly.

Hate underpins a variety of criminal behaviors, including terrorism, hate crime, and hate speech. However, disciplinary fragmentation has obscured their relationships. This chapter reviews the multidisciplinary research evidence concerning the relationships between terrorism, hate crime, and hate speech. It uncovers the empirical and theoretical knowledge gaps, and it proposes a new theoretical framework—Ecosystems of Hate—which aims to provide the intellectual parameters for a new research agenda to build systematic and cumulative knowledge about the shared causes, effects, and correlates between different hate behaviors. In closing, this chapter discusses the advantages and limitations of adopting an ecological framework focused on the interrelations among terrorism, hate crime, and hate speech.

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