I smell a lawsuit, because this is abject invasion of privacy. Facebook is a public space, and to punish kids for what they post outside of school is none of the fucking district's concern.
And oooh, they're *posting on Twitter* during school~ so scaaaaary... y'know, it's not like I couldn't do that ten years ago from an ipod with wifi... oh wait, yes I could, and did. Never heard shit about it from my teacher father, either.
These guys are grade-A idiots, and they deserve to face hefty fines and legal restrictions for the next couple decades.