As long as the staff member can show a detailed educational plan for the use of Twitter/Skype/etc., there should be little problem with unblocking.
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12 Characteristics Of An iPad-friendly Classroom | TeachThought - 4 views
http://hccweb2.org/eAssessment - 8 views
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15+ Ways of Teaching Every Student to Code (Even Without a Computer) | Edutopia - 3 views
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