A large number of U.S. medical schools say students have posted unprofessional material on Web sites such as MySpace, Facebook, and Twitter, but few schools have adequate policies in place for dealing with such behavior, a study found. Of 78 U.S. medical schools that responded to a survey, 60% reported incidents of students posting unprofessional content online, including material that was classified as profane, discriminatory, sexually suggestive, or violated patient confidentiality, according to the report.