Are schools' firewalls too restrictive of Internet content?

Many teachers say they are frustrated by school firewalls that limit the Internet content available to students and educators. John Norton, co-founder of the Teacher Leaders Network, posted portions of a recent online discussion in which educators said firewalls have prevented them from accessing useful teaching resources and learning tools, such as Skype, Twitter and YouTube. However, one administrator also noted that the firewalls are there for a reason -- to protect students. Teacher Magazine