They can attempt to search for their child's profile. Don't only search for them by name. Search by school. Don't overreact. Don't yank the modem out of the wall. Focus on the fact that if they're not careful, they're a sitting duck. Don't get into value judgments about their taste and their issues. Knives in the hands of a chef can to productive things. But knives in the hands of a child who isn't trained to use it can be dangerous.