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Contagion in online social networks (OSN) occurs when users are exposed to information disseminated by other users. Studies of contagion are largely devoted to the spread of viral information and to local neighbor-to-neighbor contagion. However, many contagion events can be non-viral in the sense of being unpopular with low reach size, or global in the sense of being exposed to non-adjacent neighbors. This study aims to investigate the differences between local and global contagion and the different contagion patterns of viral vs. non-viral information. We analyzed three datasets and found significant differences between the temporal spreading patterns of local contagion compared to global contagion. Based on our analysis, we can successfully predict whether a user will be infected by either a local or a global contagion. We achieve an F1-score of 0.87 for non-viral information and an F1-score of 0.84 for viral information. We propose a novel method for early detection of the viral potential of an information nugget and investigate the spreading of viral and non-viral information. In addition, we analyze both viral and non-viral contagion of a topic. Differentiating between local versus global contagion, as well as between viral versus non-viral information, provides a novel perspective and better understanding of information diffusion in OSNs. [ABSTRACT FROM AUTHOR]

Using Christopher Walker's and Jessica Ludwig's 'sharp power' theoretical framework, and based on some preliminary findings from the May 2019 European Parliament election and the two 2019 rounds of elections in Israel, this article describes a novel method for the automatic detection of political trolls and bots active in Twitter in the October 2019 federal election in Canada. The research identified thousands of accounts invested in Canadian politics that presented a unique activity pattern, significantly different from accounts in a control group. The large-scale cross-cross-sectional approach enabled a distinctive perspective on foreign political meddling in Twitter during the recent federal election campaign. This foreign political meddling, we argue, aims at manipulating and poisoning the democratic process and can challenge democracies and their values, as well as their societal resilience. [ABSTRACT FROM AUTHOR]