Online platforms have been increasingly misused by ill-intentioned actors, affecting our society, often leading to real-world events of social significance. On the other hand, recognizing the narratives related to harmful behaviors is challenging due to its complex and sensitive nature. The Cyber Social Threats Workshop 2020 aimed to stimulate research for the challenges on methodological and ethical considerations in developing novel approaches to analyze online harmful conversations, concerning social, cultural, emotional, communicative, and linguistic aspects. It provided a forum to bring together researchers and practitioners from both academia and industry in the areas of computational social sciences, social network analysis and mining, natural language processing, computational linguistics, human-computer interaction, and cognitive scientists to present their related, fundamental research and emerging applications, to exchange ideas and experiences, and to identify new opportunities for collaboration.

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