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Much qualitative research has drawn an association between social media and domestic terrorism, with the studies reaching different conclusions. However, few empirical studies have evaluated whether the surge in social media participation affects domestic terrorist events. Controlling for common explanations in the literature, we conduct a cross-national, time-series analysis of up to 151 countries from 2000 to 2019 to assess the impact of social media penetration on domestic terrorism. We find that greater social media penetration increases the likelihood of domestic terrorism in countries as it supports extremists' ability to recruit, mobilize, and train terrorists. Using mediation analysis, we also find that greater social media penetration amplifies online and political polarization, increasing the likelihood of domestic terrorism events. Our work indicates the possible mechanisms linking social media and domestic terrorism and the need to develop and apply appropriate counterterrorism strategies to mitigate terrorist operations. [ABSTRACT FROM AUTHOR]

• A configurational analysis of technological-social factors affecting vaccine coverage is proposed. • High individuals' functional literacy is associated with country-level coverage above 95%. • Country-level positive attitude toward science is associated with coverage above 95%. • The above conditions should be associated with low social media penetration to reach 95% coverage. This paper investigates the role of crucial technological and social factors in enhancing or undermining vaccine coverage rates at the country level worldwide. Employing five country-level databases, it explores how different combinations of technology diffusion (that is, social media penetration) and social conditions (functional literacy and attitude toward science) affect the level of vaccine coverage. The analyses are based on two built ad-hoc longitudinal datasets of 36 and 40 countries worldwide, employing a fuzzy-set qualitative comparative analysis (fs-QCA) approach. The findings highlight that, at the country level, the absence of high social media penetration, combined with an above-average level of functional literacy and positive attitude toward science, enable vaccine coverage to reach the level recommended by health institutions and authorities. [ABSTRACT FROM AUTHOR]