Public school districts often block access to online social media tools. While considered a preventive measure to ensure student safety and limit district liability, this policy strips school librarians and their collaborating teachers of opportunities to instruct students in using social media tools creatively and responsibly. Using one school district as a case study, this study examined the perceptions and responses of high school librarians to district policies that limit the use of social media tools. It was determined that the way the school district presented its policies could affect how school librarians perceived and applied them. As the school district unintentionally shifted from formal to informal to implied policy documentation, this study found that the school librarians' perceptions and applications of the policies varied substantially.