The topic of privacy and school divisions overstepping their legal boundry is a hot and ongoing item.  Here are several more articles on the topic.

Arlington expands social media rules for teachers
Under a new policy, Arlington teachers would have to register social media accounts geared toward instruction — such as a class Facebook page or a Twitter account used for homework reminders — with their principals, who would be allowed to request the account’s password.
In the Digital Age, Welcoming Cell Phones in the Class





Do schools have the right to expel students for tweets?
"The ’automatic tracking system’ the school uses apparently tracks tweets whenever a student logs in to their account. There is a question mark circling around whether the system actually works or not — as the student states his message was sent outside both school grounds and hours."



The implications of schools demanding access to student mobile devices
"As the backlash from the parents of affected students increases, schools are looking for ways that they can legally monitor cyberbullying — which usually takes the form of text messages or communication across social networks."



Amidst a Mobile Revolution in Schools, Will Old Teaching Tactics Work?
“People are talking about this being an inflection point,” said Elliot Soloway. Soloway is a professor at the School of Education at the University of Michigan, and a longtime proponent of mobile learning. “It feels like something major is about to happen. It went from a silly idea, to, ‘Of course it’s inevitable.”

But recently – in the last two or three years – something has changed. Schools seem to be getting over their fears and want to bring the Web and social media and all the attendant digital tools into the classroom. You can see this change reflected in a slew of new Acceptable Use Policies (AUPs) across the country that emphasize responsibility over mere acceptance and the implementation of school-wide blogs and even the distribution of smartphones for classroom use.