A reflection of how the internet functioned in Japan in 2018 can be seen in a recent incident at Shinjuku Station.

On Dec. 18, Twitter user @Diablo_Lucifero warned women using the transportation hub to be on the alert for multiple men who were apparently going out of their way to shove female commuters. They uploaded a photo of what they claimed was an arm that had been injured in one such attack, adding that a colleague had also suffered damage to their ribs.

The post attracted responses reporting similar incidents, while the whole situation soon went viral.