SERIOUS BLOCKAGE: Think your school’s Internet filtering policies are ridiculous? Compare them to high school student Nathan Ringo’s and you may want to reconsider. As Ringo writes, his school in Wayzata, Minnesota blocks sites used in class (like Twitter), Wikipedia, news websites--basically anything that may contain a bad word. Worst of all, when Ringo warned his fellow students of the tracking imposed on their school-issued iPads, he was called into the principal’s office.