The Chicago Tribune reports that, like their colleagues in school systems across the country, Chicago Public Schools leaders walk a fine line when determining which online postings are protected by free-speech rights and which should be punished as a threat to students or staff. This debate is now taking place at a local Edison Park school, where the principal has called a meeting this week of parents and students to discuss the “legal and moral issues involved with blogging” … (Note: This site requires free registration.)