Teens are among the most avid users of online journals and personal Web pages, but recent incidents at North Carolina State University and other schools should give them and their parents pause.

Nine underage students at N.C. State are facing charges of violating the school’s alcohol policy after a residential adviser visited one of their profiles on Facebook and found links to pictures of them drinking. Facebook, which lets students create and share personal profiles, is enormously popular on campuses nationwide.

Though some parents might be reassured to know that schools are keeping an eye on their children’s behavior, the case makes it clear that teens can be reckless when it comes to posting personal information online.