Dan, I have been thinking back some sixty years ago now to my own teen years - which were difficult with lots of depression - and I STILL cannot even conceive of how I could ever be vulnerable to something like your videos describe.
The Internet has immense potential for human benefit, but there seems to be a dark side also...
Here is what I think we need to consider, world-wide: NOT to leave adolescents unsupervised in large groups, and that includes limiting Internet access, until they are stabilized into healthy adulthood...too much downside potential for a LORD OF THE FLIES kind of situation, on the order of Golding's novel.
What a tragedy to lose these beautiful young people to such a menacing game!