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To examine the hypotheses, in particular, to quantify the social norms shift, the study utilized an adoption threshold measure based on Twitter retweet networks. Our empirical study focused on the hate speech spread effect of an announcement by Yuriko Koike, Governor of Tokyo, declining to participate in a memorial ceremony for Korean massacre victims. The results support the hypothesis: after Koike\u2019s announcement, adoption thresholds of hate speech users were significantly lowered, while the number of hate speech users increased. Further, this study compared the effect of Koike\u2019s announcement to the effect of a North Korean missile launch, a national security threat to Japan. The average hate speech adoption threshold was lower after Koike\u2019s announcement than after the missile launch, suggesting that a leading politician\u2019s behavior could have a greater impact on shifting norms of prejudice than even a nationally threatening event.<\/jats:p>","DOI":"10.1007\/s42001-024-00268-5","type":"journal-article","created":{"date-parts":[[2024,4,6]],"date-time":"2024-04-06T12:01:27Z","timestamp":1712404887000},"page":"1161-1186","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The impact of politicians\u2019 behaviors on hate speech spread: hate speech adoption threshold on Twitter in Japan"],"prefix":"10.1007","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6887-7966","authenticated-orcid":false,"given":"Taehee","family":"Kim","sequence":"first","affiliation":[]},{"given":"Yuki","family":"Ogawa","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,4,6]]},"reference":[{"key":"268_CR1","unstructured":"Allen, C., & Nielsen, J. 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