I'm sure the Reverend's heart is in the right place, but I smell a winning lawsuit by any student who is suspended for this, unless there is something covering this in the school's contract with the parents.
One thing I'm not sure of, though, is whether or not our libel laws extend to internet postings.
If they do, then in that case the students had better be careful about what they write, or the lawsuits will be against them.
