Some schools in Ohio and Kentucky are relaxing their policies on social-media use in schools. Educators say that with about 75% of students nationwide using such sites each week, it makes sense that they should use them in school. Schools are using YouTube, Facebook and other websites to advertise to potential students, and teachers are using sites such as Twitter and Skype in classroom lessons. Still, about 70% of school districts ban social-networking sites, according to a nationwide survey.

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