Public mobilization through digital media has emerged as a transformative force in shaping collective action, opinion formation, and civic engagement on a global scale. Prominent digital campaigns such as the #MeToo and Black Lives Matter movements in the United States have demonstrated how viral content can generate significant social impact by facilitating rapid message dissemination, fostering emotional solidarity, and prompting mass participation (Jackson et al., 2020). Social media platforms including Twitter, Instagram, and TikTok have become pivotal tools in influencing public sentiment and activating political consciousness (Tufekci, 2017). While the role of social media in mobilization is well-documented in movements such as the Arab Spring (Howard et al., 2011) and the Hong Kong pro-democracy protests (Lee & Chan, 2018), the mechanisms behind digital mobilization in developing countries remain relatively underexplored.

This study addresses that gap by focusing on Indonesia, a highly connected nation where digital platforms are deeply embedded in daily life. As of 2024, over 201 million Indonesians, nearly 74% of the total population, actively use social media, with a particularly high concentration among users aged 18 to 34 (Panggabean, 2024). This digital penetration, combined with a vibrant youth demographic, makes Indonesia an ideal context to investigate the dynamics of online political engagement and grassroots mobilization.

A compelling example of this phenomenon is the viral video Peringatan Darurat (Emergency Warning), narrated by journalist Najwa Shihab. The video critically addressed proposed amendments to the Regional Head Election Law (UU Pilkada), sparking widespread outrage and leading to mass protests both online and offline. The movie begs issues on whether the rushed judgments taken by the House of Representatives' (DPR) could be undemocratic and unconstitutional. Given over 352,000 users contributed 1.9 million likes and over 352,000 shares, this topic attracted a lot of public reaction. Emotional intensity and the sharing of knowledge on social media platforms seem to be favorably linked empirically. Studies show that on these platforms expressing rage or discontent considerably increases the audience for content (Bellovary et al., 2021; Knutson et al., 2024). Thus, by serving as both an educational tool and a motivator of group engagement, the "Peringatan Darurat" video best depicts the power of digital activism in Indonesia. Therefore, With over 1.9 million views in 48 hours and hundreds of thousands of shares and comments (CNBC Indonesia, 2024), the video exemplifies how viral content can serve as both an informational and emotional catalyst for civic action. Its ability to engage audiences and provoke mass response highlights the intersection of credibility, emotional resonance, and participatory culture in digital activism.

Despite the growing relevance of such cases, dominant theories of digital mobilization are still largely rooted in Western, individualistic contexts. These models often fail to capture the cultural specificities of collectivist societies like Indonesia, where values such as communal trust, moral duty, and social solidarity heavily influence public behavior. This research contributes to the literature by examining how culturally grounded variables, namely source credibility, moral emotions, and social engagement, mediate the relationship between viral video exposure and public mobilization.

This study offers a culturally contextualized model of digital mobilization by integrating multiple theoretical frameworks, Viral Content Diffusion Theory, Digital Mobilization Theory, Moral Foundations Theory, the Source Credibility Framework, and the Social Engagement Framework, within a Southeast Asian context. This theoretical synthesis is rarely seen in prior research and allows for a more holistic understanding of how viral digital content shapes civic participation in Indonesia. Therefore, this study seeks to answer the following research question: How do source credibility, moral emotions, and social engagement mediate the relationship between exposure to viral video content and public mobilization in the Indonesian digital context?

This study employs a quantitative research design to investigate the relationships among viral video exposure, source credibility, moral emotions, social engagement, and public mobilization. The research is theoretically grounded in five interrelated frameworks: Viral Content Diffusion Theory (Berger & Milkman, 2012; Tandoc et al., 2018), Digital Mobilization Theory (Tufekci, 2017; Bennett & Segerberg, 2013), Moral Foundations Theory (Haidt, 2012; Graham et al., 2013), the Source Credibility Framework (Ohanian, 1990; Pennycook & Rand, 2021), and the Social Engagement Framework (Castells, 2012; Papacharissi, 2014). Together, these frameworks provide a comprehensive lens through which to examine how digital content influences trust, moral affect, and participatory behaviors in mobilization processes.

Data were collected from Indonesian social media users who had viewed the viral Peringatan Darurat (Emergency Alert) video on digital platforms including Instagram, X (formerly Twitter), YouTube, TikTok, WhatsApp, and Facebook. A non-probability purposive sampling strategy was employed to ensure that respondents met the inclusion criteria: individuals between 17 and 65 years of age who had seen the Peringatan Darurat video. To ensure a diverse and representative sample, the online questionnaire was widely distributed via social networking sites using Google Forms.

The minimum required sample size was calculated using the Lemeshow formula, which is appropriate when the total population size is unknown. Based on a 95% confidence level (Z = 1.96), a population proportion of 0.5, and a margin of error of 5%, the recommended sample size was 384 respondents (Lemeshow et al., 1990; Pourhoseingholi et al., 2013). Out of 420 completed responses, 384 were deemed valid and suitable for analysis, resulting in a high response rate of 91.4%.

The study employed previously validated measurement instruments adapted from established research. Items measuring viral video impact were drawn from Berger and Milkman (2012) and Tandoc et al. (2018), while source credibility items were based on Pennycook and Rand (2021). Moral emotions were assessed using items from Brady et al. (2017), social engagement from Boulianne (2015), and public mobilization from Castells (2012). All items were adapted to reflect the Indonesian digital activism context. A six-point Likert scale was used for all constructs, ranging from 1 (strongly disagree) to 6 (strongly agree). Both content and construct validity were assessed to ensure the relevance and clarity of the adapted items.

Data analysis was conducted using the Generalized Structured Component Analysis (GSCA) technique, implemented via the GeSCA Pro software. GSCA is a variance-based structural equation modeling approach that is particularly well-suited for analyzing complex models with non-normally distributed data (Hwang & Takane, 2014; Henseler et al., 2014; Sarstedt et al., 2017, 2022). One of GSCA’s major strengths lies in its ability to simultaneously estimate direct and indirect effects, making it highly effective for testing mediation mechanisms (Hayes, 2013; Preacher & Hayes, 2008). The analytical procedures adopted in this study are consistent with those used in similar research exploring media influence on political behavior, such as the study by Pamungkas et al. (2025).

Through this methodological framework, the study aims to generate in-depth and nuanced insights into how source credibility, moral emotions, and social engagement function as mediating variables in the relationship between viral digital content and public mobilization within Indonesia’s networked society.

Respondent Description

Table 1 shows the demographics of Indonesian social media users engaged in this research. By means of an online questionnaire sent via Google Forms, the data were gathered effectively and responders from all backgrounds throughout Indonesia could be reached.

Source: Processed Data (2025).

Respondent Overview

Indonesian social media users between the ages of 17 and 65 exhibited notable engagement with the Peringatan Darurat video. Among the respondents, 46.9% were male and 53.1% were female, reflecting a balanced gender distribution. Regarding educational attainment, 52.4% had completed high school or its equivalent, while 18.2% held a diploma (D3/D4), indicating a moderately educated sample. In terms of occupation, 36.5% of participants identified as students, followed by 29.8% as private sector employees, 12.0% as civil servants, 14.7% as entrepreneurs or freelancers, and 7.0% fell into other professional categories. This occupational diversity adds depth to the analysis by representing a broad spectrum of Indonesian society.

Regarding social media usage, 74.8% of respondents reported high engagement levels (more than 3 hours per day), while 25.2% reported lower usage levels (less than 3 hours per day). This highlights the predominance of digital connectivity among the sample population. Respondents also identified the platforms through which they viewed the Peringatan Darurat video. TikTok was the most frequently cited platform (36.5%), followed by Instagram (28.4%), YouTube (16.2%), X (formerly Twitter) (9.7%), WhatsApp (5.1%), and Facebook (4.1%). This distribution underscores the dominant role of TikTok in circulating politically charged content among Indonesian users. Notably, the high level of engagement, especially among younger demographics, suggests a strong political and social awareness within the Indonesian online community. These findings imply that viral content has substantial potential to trigger public mobilization, particularly when disseminated through trusted sources and emotionally resonant messages. The results also reflect the evolving landscape of political discourse in Indonesia, which is increasingly shaped by user-driven digital participation.

Measurement Model Evaluation

The reliability and validity of the measurement model were confirmed. All item loadings exceeded 0.70, ensuring strong indicator reliability. Composite reliability values for all constructs were above 0.89, and Cronbach’s alpha values also exceeded the 0.85 threshold, confirming high internal consistency. PVE values ranged from 0.601 to 0.632, indicating strong convergent validity. HTMT ratios were below 0.90 for all construct pairs, supporting discriminant validity.

Loading Factor

Table 2 shows the loading factor values for each indicator representing its latent construct. The loading factor measures the correlation between an indicator and its latent construct. According to Hair et al. (2019), a loading factor value of ≥0.708 is considered ideal, but values ≥0.6 are still acceptable in the context of exploratory research (Ngatno & Dewi, 2019). Indicators with values below 0.6 were eliminated, ensuring that all remaining indicators are valid in representing their respective latent constructs.

This study offers a contextualized understanding of how viral content contributes to public mobilization in a collectivist society. By examining the Peringatan Darurat video, it reveals that source credibility, moral emotions, and social engagement serve as key psychological and sociocultural mechanisms that shape collective responses to politically charged digital content. The findings extend digital mobilization theory by demonstrating that viral content alone is insufficient to mobilize public action; rather, it is the mediated pathways, particularly trust, emotion, and participatory behavior, that determine the intensity and reach of such mobilization.

One of the most significant contributions of this study is the demonstration that viral content can directly influence public mobilization, aligning with foundational ideas from the Viral Content Diffusion Theory. Prior research by Guadagno et al. (2013) and Tandoc et al. (2018) supports the notion that highly emotional and visually stimulating content increases the likelihood of sharing and response. The current findings reinforce this by showing that Indonesian audiences responded strongly to the Peringatan Darurat video not only because of its content but because of how it emotionally and morally resonated with viewers.

Moreover, the mediating role of source credibility builds on previous studies that emphasize the importance of trust in digital communication. This aligns with the work of Flanagin and Metzger (2008) and O’Keefe (2002), who found that trust in a messenger significantly shapes how audiences interpret and act upon messages. However, this study adds cultural nuance by showing that in collectivist societies like Indonesia, credibility is also constructed through moral reputation and communal values. This finding complements recent Southeast Asian research that suggests trust is not only perceived in institutional terms but also through moral alignment and social proximity (Lim, 2017; Kieling et al., 2022).

The emotional component of digital mobilization has been addressed in earlier work, particularly within Moral Foundations Theory (Haidt, 2012). In line with these frameworks, this study shows that moral emotions such as outrage, empathy, and guilt are not merely psychological responses but also motivators of collective behavior. In collectivist settings, where individuals often act in accordance with shared norms and social expectations, emotional resonance becomes a powerful mobilizing force. This resonates with studies by Van Zomeren et al. (2008) and Skitka et al. (2021), and further supports the growing consensus that moral emotions are central to digital political engagement.

The study's most compelling insight concerns the role of social engagement as the strongest mediator between viral video exposure and mobilization. While many prior studies, particularly in Western contexts, have emphasized the importance of individual-level expression (Bennett & Segerberg, 2013), this study suggests that in Indonesia, engagement is deeply embedded in collective digital behavior. This finding is consistent with the Social Engagement Framework (Boulianne, 2015; Valenzuela, 2013), but adds new cultural depth by showing how online participation reflects a digital form of gotong royong, a collectivist ethic of mutual aid. The viral spread of hashtags such as #PeringatanDarurat and #KawalPutusanMK exemplifies how digital participation is not just reactive but symbolic of a shared political identity.

In comparison with studies conducted in other Southeast Asian countries, such as Malaysia and the Philippines, this research affirms regional similarities in how digital media are used for political expression. For example, cases of youth-led mobilization in the Philippines during elections or Malaysian environmental protests demonstrate similar patterns of emotionally driven, socially amplified activism. However, unlike those contexts where religious or ethnic affiliations often dominate mobilization discourse, this study emphasizes legal and democratic values as the unifying cause, showing that digital mobilization can transcend identity politics when framed around national democratic ideals.

Theoretically, the integration of multiple frameworks such as Viral Content Diffusion Theory, Digital Mobilization Theory, Moral Foundation Theory, Source Credibility Framework, and Social Engagement, enables a more layered understanding of how digital mobilization unfolds in non-Western contexts. The study moves beyond simplistic causal models and instead presents a culturally embedded view of activism (Kietzmann et al., 2011). It highlights that emotional resonance, social trust, and participatory affordances must be understood as mutually reinforcing components in driving public action. This challenges existing assumptions in Western-centric mobilization models, which often neglect the relational, moral, and communal aspects of communication in collectivist societies.

Practical Implications

The findings of this study offer valuable practical insights for legislators, activists, media professionals, and policymakers aiming to foster civic engagement through digital platforms. When delivered by credible and trusted sources, viral videos can be strategically utilized to disseminate public knowledge and raise awareness about pressing social or political issues. This is particularly important in environments where institutional trust is fragile and where digital media serve as the primary channel for information and discourse. To enhance public participation, media professionals are encouraged to create content that not only captures attention but also evokes strong moral emotions such as empathy, moral outrage, or guilt. Emotionally resonant narratives that highlight injustice or social inequality have the potential to catalyze collective support and stimulate civic action. Therefore, well-crafted digital storytelling becomes a vital tool for initiating and sustaining social movements.

Moreover, government agencies and non-governmental organizations (NGOs) can amplify civic engagement by collaborating with credible public figures to deliver emotionally engaging and trustworthy messages. For example, NGOs advocating for electoral transparency could partner with respected journalists or influencers to launch viral campaigns that encourage youth participation and political awareness. Policymakers may also consider incorporating participatory communication strategies into digital democracy initiatives to improve public responsiveness and inclusivity. By understanding the interplay between credibility, emotion, and engagement, stakeholders can design more effective digital interventions that not only inform but also mobilize audiences toward constructive democratic participation.

This study demonstrates that the Peringatan Darurat video successfully catalyzed mass mobilization through the combined influence of source credibility, emotionally charged narrative, and participatory digital engagement. The findings highlight how viral content, when aligned with credible messaging and moral appeals, can significantly shape public behavior, particularly within developing countries such as Indonesia. This reinforces earlier findings by Hapsari and Pamungkas (2024), who emphasized the role of cognitive engagement in shaping online behavior through social media.

The study confirms that viral videos exert both direct and indirect influences on public mobilization, with source credibility, moral emotions, and social engagement serving as significant mediators. These insights contribute to a deeper understanding of the mechanisms driving digital mobilization and provide a practical framework for designing effective civic-oriented communication strategies. Furthermore, the study emphasizes the need to prioritize ethical communication practices in Indonesia’s digital ecosystem to ensure that viral content supports inclusive democratic engagement rather than promoting polarization or misinformation.

Nevertheless, the study is not without limitations. The reliance on purposive sampling, focusing on active social media users, may limit the generalizability of the findings to broader populations, particularly those with limited digital access or lower levels of media literacy. Additionally, the use of self-reported data introduces the possibility of response biases, including social desirability effects. The absence of qualitative triangulation is another limitation, as the study relied solely on quantitative measures, which may not fully capture the complexity of emotional and motivational factors underlying user behavior.

Future research should consider employing mixed-method designs to provide more nuanced insights into user motivations and emotional responses. Experimental approaches may also help to identify causal relationships more precisely and enhance the robustness of communication strategies aimed at fostering democratic engagement through digital media.

Acknowledgement Statement: The authors sincerely express their gratitude to all individuals and institutions that contributed to this research. Special appreciation is extended to the Communication Science Program at Universitas Semarang for their generous support and provision of essential resources, which played a crucial role in the successful completion of this study.

Conflicts of interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Authors' contribution statements: Yoma Bagus Pamungkas conceptualized the study, provided resources, managed project administration, and secured funding. Richiana Hapsari was responsible for the methodology, investigation, formal analysis, and data curation. Both Yoma Bagus Pamungkas and Richiana Hapsari jointly supervised the research process. The original draft of the manuscript was written by Yoma Bagus Pamungkas, with contributions to writing, review, and editing by Yuwanto, Muhammad Adnan, and Nurul Hasfi. Richiana Hapsari also contributed to the writing, reviewing, and editing stages of the manuscript.

Funding statements: As there was no external funding received for this research, the study was conducted without financial support from any funding agency or organization.

Data availability statement: Data is available at request. Please contact the corresponding author for any additional information on data access or usage.

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