Core Viewpoint - The incident in Hangzhou regarding the foul-smelling tap water led to widespread public panic and the spread of rumors about sewage contamination, highlighting the impact of misinformation during a crisis [1] Group 1: Incident Overview - A significant number of residents in Hangzhou believed in rumors of sewage entering the water supply, resulting in chaotic scenes such as water hoarding in supermarkets and hotels [1] - The official response took nine hours, which contributed to the spread of panic and misinformation [1] Group 2: Misinformation Dynamics - Rumor-mongers exploited the information vacuum by creating fake announcements, which fueled public anxiety and engagement on social media [1] - The phenomenon illustrates the effectiveness of black public relations tactics, particularly in times of crisis [1]