Is cyber libel really the official charge? Why would you have to specify cyber? I makes as much sence as being charged with acoustic or offset libel to me.
The difference between libel and "cyber libel" is just the medium. Arguably it'd be more like the difference between how the 1st and 4th amendments should be applied in your home vs. on Facebook. But like the GP, I'm not aware of specific cyber libel laws or charges.
Non-hate crimes don't have this effect. They don't make a group feel afraid, singled out, and specifically targetted.