My first reaction of course is to run to the Constitution. I think there are some 1st amendment issues though I haven't been a good enough Googler to find the text of the law. Here's a blurb:
N.C. makes cyberbullying teachers illegal | www.wsoctv.com
And if you search in Google there's a lot of buzz nationwide on it since the 18th.
This seems to be the law before the teacher stuff was added:
GS_14-458.1
If anyone can find a link to the new text I'd appreciate it.