Some school districts in Missouri (I live in Illinois, but get my news from St. Louis) were informing their teachers that it included their own children. To me, that is carrying things too far.
This is from the article posted on KSDK:
"The judge said the teachers' lawsuit had a good likelihood of success. His order noted that social networking sites are used extensively by teachers and that the law would have restricted online communications even between family members in which teachers are parents.
"The breadth of the prohibition is staggering," Beetem wrote."
Basically the law requires revisions, as I do not (personally) believe that any communication between a parent and their child or other minor relatives at a minimum needs to go through the parents' employer if the parent happens to be a teacher.