The 2024 U.S. presidential election provided a natural experiment to explore how digital behaviours evolve under stress. Within a critical two-week span in July 2024, the political landscape was rocked first by an assassination attempt targeting Donald Trump at a public rally on July 13, and shortly thereafter, by Joe Biden’s announcement suspending his re-election campaign on July 21. These seismic events served as a catalyst for an unprecedented shift in the tone and content of political discourse on social media platforms, primarily Facebook.

To understand this transformation, the research team amassed an extensive dataset comprising over 62,000 public Facebook posts from a wide array of U.S. political actors, media commentators, and institutional outlets aligned with both Republican and Democratic perspectives. Employing rigorous computational text analysis and sentiment categorization methods, the study dissected the emotional and thematic qualities embedded in these posts before, during, and following the crisis moments, seeking patterns in engagement metrics such as shares, comments, and likes.

Historically, negative sentiments—in particular anger, outrage, and hostile partisanship—have been recognized as potent drivers of social media virality, acting as “rocket fuel” that amplifies political content to broad audiences. This phenomenon is grounded in psychological mechanisms where threat and conflict stimulate heightened arousal and motivation to react online. Conventional wisdom thus anticipated an even more intense surge of antagonistic posts and consequent engagement during the 2024 crises.

However, the empirical evidence uncovered is strikingly counterintuitive. Following the attempt on Trump’s life, posts emanating from the Republican sphere that emphasized unity, shared identity, and ingroup cohesion experienced a remarkable 53% increase in engagement compared to preceding days. This uplift represented a significant 17 percentage point jump, signaling a pivot away from outgroup-focused antagonism toward inward-facing solidarity. Exemplars included messages from religious leaders expressing gratitude for Trump’s survival and media figures framing his resilience as a rallying symbol for America.

Simultaneously, content coded as hostile or adversarial towards Democrats saw a notable decline in interaction, with Republican posts attacking their political opponents waning in engagement by 23 percentage points. This suggests that the collective shock imposed by the assassination attempt dampened the usual appetite for divisive rhetoric, instead fostering a common psychological imperative to consolidate within-group bonds for protection and morale.

A parallel yet even more pronounced effect unfolded after Biden’s announcement on suspending his re-election bid. Democrat-aligned social media posts marked by themes of solidarity, respect, and shared values soared in popularity, generating 91% more engagement relative to previous levels—a dramatic spike of 71 percentage points. Revered political figures extolled Biden’s legacy, emphasizing continuity and collective purpose despite electoral uncertainty. Contrasting with Republican dynamics, criticism of the opposition party among Democrats continued to incrementally increase but at a less dominant rate, reflecting nuanced differences in crisis-driven social media behaviour across ideological lines.

Underlying this shift is a psychological framework in which ingroup love—the emotional preference and affection for one’s own community—surpasses outgroup hate as the principal determinant of attention and sharing during existential or high-stakes threats. These findings resonate with prior research from the same Cambridge lab, which analyzed social media responses during other acute geopolitical crises, such as Russia’s full-scale invasion of Ukraine in 2022. In that context, posts celebrating national unity and shared identity surged dramatically, while hostile commentary directed at the aggressor attracted comparatively less engagement.

Beyond empirical observation, the study advances a theoretical challenge to dominant narratives about digital polarization. While platforms like Facebook and Twitter are often criticized for exacerbating division through algorithmic amplification of anger and outrage, the new evidence illuminates the malleability of social media’s emotional ecosystem. At moments of profound uncertainty and threat, humans appear to gravitate toward social cohesion online, prioritizing collective resilience over factional conflict.

Moreover, the research highlights critical implications for the design of information environments and the potential to harness social media not merely as battlegrounds of partisan hostility but as venues for cultivating solidarity and mutual support under duress. Understanding these dynamics could inform platform moderation policies, media strategies, and interventions aimed at mitigating polarization while reinforcing social fabric during crises.

Key to these insights was the collaboration of interdisciplinary experts in psychology, data science, and political communication, who integrated sentiment analysis with discourse evaluation, engagement metrics, and contextual political knowledge. The lead author, Malia Marks, PhD candidate at Cambridge’s Department of Psychology, emphasizes the importance of viewing social media behaviour through both emotional and structural lenses to capture the complex interplay between online expression and offline realities.

Co-author and senior researcher Dr. Jon Roozenbeek reflects on the broader resonance of the findings: “Our study underscores that ingroup love, rather than outgroup hate, can dominate social media behavior in times of crisis—even in deeply polarized societies like the United States. This challenges prevailing assumptions and opens avenues for more hopeful perspectives on digital political engagement.”

In sum, this research redefines our understanding of digital political communication by demonstrating that collective solidarity emerges as the crucial viral driver during moments when political leadership is threatened, transforming social media from arenas of discord into bastions of communal support. The implication is profound: in the swirling chaos of modern politics, shared identity and unity still possess unparalleled power to shape public discourse.

Subject of Research: Social media engagement dynamics and emotional content shifts during political crises in the 2024 U.S. presidential election.

Article Title: Ingroup solidarity drives social media engagement after political crises

News Publication Date: 29-Aug-2025

Web References:

• https://www.pnas.org/doi/abs/10.1073/pnas.2512765122
• https://www.nature.com/articles/s41467-024-52179-8

References:
Marks, M., Kyrychenko, Y., Roozenbeek, J., et al. (2025). Ingroup solidarity drives social media engagement after political crises. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.2512765122

Keywords: Social media engagement, political crises, ingroup solidarity, digital behavior, online virality, political polarization, 2024 U.S. election, emotional contagion, computational social science, political communication

Historically, cancer metastasis—where cancer cells spread from their original location to other parts of the body—has been a key factor in cancer fatalities, attributing to approximately 90% of cancer deaths. The study, published in the esteemed journal Nature, sheds light on how aspirin can stimulate the immune system in a way that curtails this perilous phenomenon. The researchers emphasized the significance of understanding this mechanism, noting that such insights will bolster ongoing clinical trials and may lead to the development of more effective cancer therapies aimed at restricting metastasis.

Previous epidemiological studies indicated that daily low-dose aspirin intake correlates with diminished metastasis in several cancers, including breast, bowel, and prostate cancers. However, until now, the underlying mechanisms of how aspirin could exert such profound effects remained elusive. By investigating the molecular interactions within the immune system, the Cambridge team ventured into new territory, focusing on how immune responses are manipulated during the metastatic process.

The research team systematically examined a collection of genes to identify candidates that might influence metastasis. Their extensive screening involved looking at 810 genes in mice, resulting in the identification of 15 genes that appeared to have a significant role in the spread of cancer cells. Among these, the gene responsible for producing a protein known as ARHGEF1 stood out. The absence of ARHGEF1 in mice resulted in notably lower levels of metastasis to vital organs like the lungs and liver, revealing its pivotal role in cancer progression.

The relationship between ARHGEF1 and the immune system was particularly intriguing, as the researchers discovered that this protein directly suppresses T cells—crucial components of the immune response capable of recognizing and destroying metastatic cancer cells. This finding hinted at a mechanism where immune suppression facilitated the dissemination of cancer, suggesting that unlocking this suppression could lead to improved immune recognition and clearance of cancer cells.

Further exploration revealed that ARHGEF1 is activated when T cells are exposed to thromboxane A2 (TXA2), a clotting factor produced by platelets. This revelation proved to be a turning point for the researchers, as TXA2 has long been associated with both clotting processes and the mechanisms by which aspirin achieves its anti-clotting effects. Importantly, aspirin functions by reducing the levels of TXA2, positioning it as a dual-action agent capable of addressing both thrombotic events and cancer metastasis.

Utilizing a mouse model of melanoma, the researchers demonstrated that aspirin administration led to a marked reduction in the frequency of metastases, affirming their hypothesis that the drug facilitates T cell reactivation against cancer cells by alleviating the suppression previously imposed by TXA2. This synergistic effect highlights the potential of aspirin not just as an analgesic, but as a powerful immunomodulatory agent capable of modifying the landscape of metastatic cancer.

Professor Rahul Roychoudhuri, the study’s lead author, articulated the implications of their findings, emphasizing that the window of opportunity exists when cancer first spreads. At this stage, cancer cells are particularly vulnerable to immune attack—a time when immunotherapies could be most effective. These results could shift the paradigm in cancer treatment strategies, focusing on early intervention rather than waiting for advanced metastatic disease.

The study also raised important considerations regarding the safe use of aspirin, acknowledging that it may pose serious side effects for some individuals, including gastrointestinal bleeding and ulcers. As clinical trials ramp up to investigate the optimal use of aspirin in cancer management, the researchers stress the importance of consulting healthcare professionals before self-medication. Their ongoing collaboration with Professor Ruth Langley for the Add-Aspirin clinical trial highlights the commitment to translating these findings into clinical practice, aiming to discern which subsets of cancer patients may derive the most benefit from aspirin therapy.

As the scientific community gears up for further research, the implications of these findings could be vast. If validated through clinical trials, aspirin or similar low-cost drugs that target this newly identified molecular pathway could revolutionize the way early-stage cancers are treated, making effective therapies more accessible globally. Furthermore, understanding this pathway allows for a more personalized approach to cancer treatment, alongside optimizing existing therapeutic modalities.

In summary, the discovery of how aspirin influences cancer metastasis by modulating immune responses offers an exciting frontier in cancer therapy. With the potential to prevent the recurrence of cancer in at-risk patients, this study underscores the need for ongoing research and clinical evaluation. The legacy of this work may not only redefine treatment protocols but could also democratize access to effective cancer care in a world where cancer remains a pressing global health challenge.

Subject of Research: Animals
Article Title: Aspirin prevents metastasis by limiting platelet TXA2 suppression of T cell immunity
News Publication Date: 5-Mar-2025
Web References: Nature
References: DOI: 10.1038/s41586-025-08626-7
Image Credits: Copyright: Jie Yang

Keywords: Metastasis, Cancer, T cell immunity, Aspirin, ARHGEF1, Immune suppression, Thromboxane A2, Clinical trials, Melanoma, Drug therapy, Cancer research, Immunotherapy.