https://qz.com/1129776/japans-twitter-killer-jack-dorsey-responds-to-serial-killer-who-used-twitter-to-lure-suicidal-victims/

An unusually gruesome string of murders in Japan has shaken the country, and it has put Twitter in the spotlight.

As Twitter wrestles with hate speech and fake news, it is also fighting unsavory publicity in Japan after a suspected serial killer—dubbed the “Twitter killer” by Japanese media—allegedly lured victims to his home by seeking out people who expressed suicidal thoughts on Twitter. Last month, police found the dismembered bodies of nine people in the home of the suspect, Takahiro Shiraishi, in Zama, Kanagawa prefecture, just outside Tokyo.