TikTok users and fans of Korean pop music claim to have spoilt a rally for US President Donald Trump by making thousands of fake ticket reservations.
K-pop fans - or, in the parlance of the internet, "stans" - have mobilized in support of a number of causes in the past few months, including in support of the Black Lives Matter movement.
So, for the uninitated, what is going on here?
Kellen Browning, a technology reporter for the New York Times, speaks to Corin Dann.
