https://thenextweb.com/security/2020/04/06/nyc-classrooms-cancel-zoom-after-trolls-make-zoombombing-a-thing/

Zoom, the company most of the world didn’t know existed before quarantine, is being banned from New York City classrooms due to some increasingly disturbing instances of “Zoombombing.”

Zoombombing, which the FBI has previously warned against, is a newish trend in which a bad actor hijacks a chat or call to transmit pornographic images, doxx others, or taunt them with hate speech and threats. Zoombombers have their own communities, sharing Zoom meeting IDs and coordinating attacks in online forums. Some have even recorded these attacks and published them on YouTube.