A recent survey of attendees at the National School Boards Association annual Technology + Learning Conference found that 50% of schools have no policies on student use of MySpace, Facebook and similar social-networking sites, and those schools that do tend to filter such sites or require students to sign acceptable-use policy during school hours. An NSBA executive recommends schools take the lead in teaching students safe and responsible use of the sites, both at school and at home. eSchool News (free registration