My head immediately jumps to YikYak but I know there were some others in this domain 10 years ago. I can't think of many recently though!
super dystopian channels got setup on there like get a yo everytime a missle alert came in Israel
Ya think? I mean, whatever could parent be referring to? :-)
https://news.ycombinator.com/item?id=41037336 (or let your eyes go drift four lines above your own comment).