Nahema Marchal
Biographic Data
| ID | 110336 |
|---|---|
| NAME | Nahema Marchal |
| GIVEN NAMES | Nahema |
| FAMILY NAME | Marchal |
| SIGNATURE | MARCHAL N |
| AFFILIATIONS | University of Oxford |
| ORCID | 0000-0002-8518-3840 |
| VERIFIED | Yes |
| TOTAL WORKS | 8 |
| TOTAL CITATIONS | 12 |
| AUTHOR COUNT | 8 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2020 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 3 |
How Negative Media Coverage Impacts Platform Governance: Evidence from Facebook, Twitter, and YouTube
Social media companies wield considerable power over what people can say and do online, with consequences for freedom of expression and participation in digital culture. Yet we still know little about the factors that shape these companies' policy decisions. Drawing on data collected from mainstream English-language news sources between 2005-2021 and on a novel dataset of policy documents from the Platform Governance Archive (PGA), we investigate…
The impact of advanced AI systems on democracy
“Be Nice or Leave Me Alone”: An Intergroup Perspective on Affective Polarization in Online Political Discussions
Affective polarization—growing animosity and hostility between political rivals—has become increasingly characteristic of Western politics. While this phenomenon is well-documented through surveys, few studies investigate whether and how it manifests in the digital context, and what mechanisms underpin it. Drawing on social identity and intergroup theories, this study employs computational methods to explore to what extent political discussions o…
How Do Individuals in a Radical Echo Chamber React to Opposing Views? Evidence from a Content Analysis of Stormfront
Calls to “break up” radical echo chambers by injecting them with alternative viewpoints are common. Yet, thus far there is little evidence about the impact of such counter-messaging. To what extent and how do individuals who inhabit a radical echo chamber engage with messages that challenge their core beliefs? Drawing on data from the radical right forum Stormfront we address this question with a large-scale content and longitudinal analysis of u…
The paradox of poor representation: How voter–party incongruence curbs affective polarisation
Research on the relationship between ideology and affective polarisation highlights ideological disagreement as a key driver of animosity between partisan groups. By operationalising disagreement on the left–right dimension, however, existing studies often overlook voter–party incongruence as a potential determinant of affective evaluations. How does incongruence on policy issues impact affective evaluations of mainstream political parties and th…
Investigating Visual Content Shared over Twitter during the 2019 EU Parliamentary Election Campaign
Political communication increasingly takes on visual forms. Yet, despite their ubiquity in everyday communication and digital campaigning, the use of these visuals remains critically understudied. In this article, we investigate the formats and modes of visual content deployed by Twitter users over a two-week period leading up to the 2019 EU Parliamentary elections and across two publics: those discussing the election at large and those discussin…
‘Coordinated Inauthentic Behaviour’ and Other Online Influence Operations in Social Media Spaces
Recently, major social media platforms such as Facebook and Twitter have announced efforts to counter "coordinated inauthentic behaviour." However, scholarly research continues to provide evidence that coordinated human and automated accounts covertly seek to undermine and manipulate public debates on these platforms. Given the difficulties in obtaining data from these platforms to study these influence operations, and the significant challenge o…
Coronavirus EXPLAINED: YouTube, Covid-19, and the Socio-Technical Mediation of Expertise
Since the coronavirus outbreak, YouTube has altered its content moderation policies to surface more 'authoritative information' while removing videos that contain 'medically unsubstantiated claims.' This was made urgent by incidents like a live-stream interview of renowned British conspiracy theorist David Icke-in which he falsely linked the spread of the coronavirus to 5G technology-that gained substantial traction online. Behind these events, h…
Investigating Visual Content Shared over Twitter during the 2019 EU Parliamentary Election Campaign
Political communication increasingly takes on visual forms. Yet, despite their ubiquity in everyday communication and digital campaigning, the use of these visuals remains critically understudied. In this article, we investigate the formats and modes of visual content deployed by Twitter users over a two-week period leading up to the 2019 EU Parliamentary elections and across two publics: those discussing the election at large and those discussin…
How Negative Media Coverage Impacts Platform Governance: Evidence from Facebook, Twitter, and YouTube
Social media companies wield considerable power over what people can say and do online, with consequences for freedom of expression and participation in digital culture. Yet we still know little about the factors that shape these companies' policy decisions. Drawing on data collected from mainstream English-language news sources between 2005-2021 and on a novel dataset of policy documents from the Platform Governance Archive (PGA), we investigate…
The paradox of poor representation: How voter–party incongruence curbs affective polarisation
Research on the relationship between ideology and affective polarisation highlights ideological disagreement as a key driver of animosity between partisan groups. By operationalising disagreement on the left–right dimension, however, existing studies often overlook voter–party incongruence as a potential determinant of affective evaluations. How does incongruence on policy issues impact affective evaluations of mainstream political parties and th…
‘Coordinated Inauthentic Behaviour’ and Other Online Influence Operations in Social Media Spaces
Recently, major social media platforms such as Facebook and Twitter have announced efforts to counter "coordinated inauthentic behaviour." However, scholarly research continues to provide evidence that coordinated human and automated accounts covertly seek to undermine and manipulate public debates on these platforms. Given the difficulties in obtaining data from these platforms to study these influence operations, and the significant challenge o…
Coronavirus EXPLAINED: YouTube, Covid-19, and the Socio-Technical Mediation of Expertise
Since the coronavirus outbreak, YouTube has altered its content moderation policies to surface more 'authoritative information' while removing videos that contain 'medically unsubstantiated claims.' This was made urgent by incidents like a live-stream interview of renowned British conspiracy theorist David Icke-in which he falsely linked the spread of the coronavirus to 5G technology-that gained substantial traction online. Behind these events, h…
How Do Individuals in a Radical Echo Chamber React to Opposing Views? Evidence from a Content Analysis of Stormfront
Calls to “break up” radical echo chambers by injecting them with alternative viewpoints are common. Yet, thus far there is little evidence about the impact of such counter-messaging. To what extent and how do individuals who inhabit a radical echo chamber engage with messages that challenge their core beliefs? Drawing on data from the radical right forum Stormfront we address this question with a large-scale content and longitudinal analysis of u…
The paradox of poor representation: How voter–party incongruence curbs affective polarisation
Research on the relationship between ideology and affective polarisation highlights ideological disagreement as a key driver of animosity between partisan groups. By operationalising disagreement on the left–right dimension, however, existing studies often overlook voter–party incongruence as a potential determinant of affective evaluations. How does incongruence on policy issues impact affective evaluations of mainstream political parties and th…
Investigating Visual Content Shared over Twitter during the 2019 EU Parliamentary Election Campaign
Political communication increasingly takes on visual forms. Yet, despite their ubiquity in everyday communication and digital campaigning, the use of these visuals remains critically understudied. In this article, we investigate the formats and modes of visual content deployed by Twitter users over a two-week period leading up to the 2019 EU Parliamentary elections and across two publics: those discussing the election at large and those discussin…
“Be Nice or Leave Me Alone”: An Intergroup Perspective on Affective Polarization in Online Political Discussions
Affective polarization—growing animosity and hostility between political rivals—has become increasingly characteristic of Western politics. While this phenomenon is well-documented through surveys, few studies investigate whether and how it manifests in the digital context, and what mechanisms underpin it. Drawing on social identity and intergroup theories, this study employs computational methods to explore to what extent political discussions o…
How Negative Media Coverage Impacts Platform Governance: Evidence from Facebook, Twitter, and YouTube
Social media companies wield considerable power over what people can say and do online, with consequences for freedom of expression and participation in digital culture. Yet we still know little about the factors that shape these companies' policy decisions. Drawing on data collected from mainstream English-language news sources between 2005-2021 and on a novel dataset of policy documents from the Platform Governance Archive (PGA), we investigate…
The impact of advanced AI systems on democracy
Political science (6 works) · Computer Science (5 works) · Politics (5 works) · Psychology (5 works) · Sociology (5 works) · Hate Speech and Cyberbullying Detection (4 works) · Law (4 works) · Social Media and Politics (4 works) · Social Psychology (4 works) · Internet privacy (3 works)