When my eldest Daughter was at school she had a real and serious problem with bullying. And to cut a long story short, a psychologist was giving a talk at one of my children's schools. And this only applies to girl's, but gives some insight I think, into some of the anxieties young people are experiencing today.
He remarked upon the developmental need that adolescent girls go through when they must form groups. He gave the example of ice-cream flavours. Girls who like chocolate will band together, as will those who like strawberry, etc,etc, and will attack girls who like other flavours.
It was thought to be a way of adolescent females defending themselves against marauding males in our prehistoric development. A girl that likes a different flavour, is essentially undermining the strength of the group.
These groups don't form in a physical sense anymore, they form in the ether, online, in chatrooms, they are massive and unstable and changeable. A girl never feels safe in her "group", never totally secure and accepted, never has a hierarchical structure in the group that last for more that a day. Never can be sure she's involved with her group when it's active, I think it's fundamentally impacting on the normal psychological processes that a girl has to experience during maturing.
Now if something similar is happening with lads, it's not difficult to understand how emotional difficulties will magnify in adolescents, whilst this continues to be the predominant format that their relationships take.