I'm not sure... there have always been horrible people around who would do this. I remember tales out of the seventies about people standing under a suicidal man on a building ledge, taunting him and telling him to just go ahead and kill himself. Heck, I remember being a kid and folks would say the meanest, nastiest things right to my face, and then smugly deny they'd ever said anything at all. It's been pretty darn normal, my entire life, for certain people to be horrible excuses for human beings.
What's different about these days is that people can share their nasty little actions and opinions with the whole world, and be exposed for exactly what they are. In 1950, this exact same scenario could have played out the exact same way. And these young people would then take themselves off home laughing, and never face any consequences for their actions whatsoever.
Today, they're known far and wide. Their identities are out there. Would you hire one of these people? Would you accept them into your college or university? Would you rent an apartment to them? Maybe you might send them death threats or vandalize their home (as folks are sometimes inclined to do these days when they're feeling outraged about something they read online).
Personally, I don't think they need to be charged. I think they're already facing a world of hurt, and there's no need to create new laws just to cover this.