'Friending' against school policy

It's against school policy in Mississippi's Lamar County Public School District for teachers and students to text each other or to be "friends" in social-networking sites. "Both texting and social networking have too many gray areas that could lead to misunderstanding and downright trouble," the Hattiesburg American reports. The policy's being considered in other Mississippi school districts as well. This reminds me of a case of teacher-to-student sexual exploitation involving texting in the news this past year (sorry I can't find the link at the moment). I'd like to hear your thoughts on the validity of this school policy - in comments here or, ideally, in the ConnectSafely.org forum.