http://www.nytimes.com/2012/03/26/education/missouri-school-district-question... Schools are required to filter their internet to protect children from "harmful" content, but it isn't always clear what should be considered "harmful" or who should get to decide. In this case, a filter used by a Missouri school was blocking sites like the Gay-Straight Alliance Network, while allowing sites like People Can Change, a religious-based program to convert gay men and women to heterosexuals.