AmiMoJo shares a report from NHK WORLD: Twitter's CEO is reacting to a grisly case in Japan where a suspected serial killer allegedly found his victims through their suicidal posts on the social media platform. In an interview with NHK, Jack Dorsey said it is unrealistic and impossible to remove suicidal tweets. But he said he hoped Twitter could become a tool for prevention. Last month, the dismembered bodies of 9 people were found in 27-year-old Takahiro Shiraishi's apartment near Tokyo. Police say he admitted to the killings. They believe he preyed on people who posted about wanting to kill themselves on Twitter. Recently, Twitter updated its rules regarding posts about self-harm: "You may not promote or encourage suicide or self-harm. When we receive reports that a person is threatening suicide or self-harm, we may take a number of steps to assist them, such as reaching out to that person and providing resources such as contact information for our mental health partners."