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In recent years, conspiracy theories have pervaded mainstream discourse. Social media, in particular, reinforce their visibility and propagation. However, most prior studies on the dissemination of conspiracy theories in digital environments have focused on individual cases or conspiracy theories as a generic phenomenon. Our research addresses this gap by comparing the 10 most prominent conspiracy theories on Twitter, the communities supporting them, and their main propagators. Drawing on a dataset of 106,807 tweets published over 6 weeks from 2018 to 2019, we combine large-scale network analysis and in-depth qualitative analysis of user profiles. Our findings illustrate which conspiracy theories are prevalent on Twitter, and how different conspiracy theories are separated or interconnected within communities. In addition, our study provides empirical support for previous assertions that extremist accounts are being “deplatformed” by leading social media companies. We also discuss how the implications of these findings elucidate the role of societal and political contexts in propagating conspiracy theories on social media.

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Research on conspiracy theories in digital media has grown considerably in recent years. As a result, the field of research has become more multidisciplinary and diverse. To bridge disciplinary boundaries, identify foci of analysis and research gaps, this study provides an interdisciplinary systematic literature review (2007–2020), analyzing current research on conspiracy theorizing online, both quantitatively and qualitatively. Findings show that the majority of studies lack a definition of conspiracy theories and fail to conceptually delineate conspiracy theories from other forms of deceptive content. We also found that while the field employs a variety of methodological approaches, most studies have focused on individual, “mainstream” social media platforms, “Western” countries, English-language communication, and single conspiracy theories. We use the findings of our review to remedy conceptual and empirical shortcomings and to provide suggestions on how to move forward in research on conspiracy theories online.

Climate change-related perceptions and communication are important factors influencing people's support for climate change policies and individual behavior. Since research on both climate change-related perceptions and communication is biased towards Western countries and standardized research methodologies, this paper investigates perceptions across South African communities using a deductive-inductive qualitative approach. 20 individuals in three communities of a South African town were interviewed about their climate change-related perceptions and communication. Results show that for individual concepts of climate change, interviewees' perceptions differed across the communities: higher educated communities had more differentiated and diverse conceptions of causes and consequences of climate change and potential countermeasures. Most interviewees, across the communities, stressed that they considered climate change as an important problem, although other social problems seemed more pressing. Interestingly, all three communities most frequently encounter the issue of climate change through new and traditional mass media, but their self-assessed knowledge about it varies widely.