3In contrast, Hungary witnessed social media transform into a powerful instrument for advocacy and justice following the murder of Megumi, a Japanese woman. Her friends harnessed these platforms to orchestrate a large-scale protest, drawing attention to police shortcomings and calling for essential reforms. These divergent examples highlight the profound impact social media can have on public safety and mental well-being, revealing its capacity to both inflict harm and foster healing.The case underlines the critical role of social media in amplifying issues that require urgent and substantial changes in how authorities handle and respond to domestic violence, demonstrating its power to both Introduction：In today's digital landscape, social media acts as a complex tool, influencing its vast audience in multifaceted ways. This article explores two significant incidents from Japan and Hungary, showcasing the vastly different consequences that can arise from online engagement. In Japan, the heartbreaking suicide of Hana Kimura, a reality television personality who faced severe cyberbullying, sparked widespread outrage and prompted legal reforms aimed at reducing online harassment. The tragic case in Budapest involving the murder of a Japanese woman by her ex-husband dramatically showcased the dual nature of social media in crisis situations. The incident, which ignited widespread online discussion, spurred a significant public demonstration organized through these platforms. Over 100 people gathered to protest the local authorities' failure to act on the victim's repeated pleas for help, highlighting her struggles with domestic violence. This public mobilization, fueled by social media, not only emphasized the community's outcry against the negligence of law enforcement but also led to a formal apology from the Hungarian police. The tragic suicide of Hana Kimura, a professional wrestler and cast member of the reality TV show "Terrace House," underscored the lethal impact of cyberbullying in Japan. After episodes portraying her in a negative light aired, Kimura faced relentless online harassment, contributing to her distress and eventual suicide in 2020. This incident not only sparked a nationwide discussion on the toxic effects of social media but also led to significant public outcry, prompting Japanese lawmakers to take decisive action.Shota Takanouchi A case in Hungary A case in JapanSemmelweis University, Budapest, HungaryThe Double-Edged Sword of Social Media
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