Ethical Implications of Anonymous Comments Posted to Online News Stories

Many news organizations invite readers to post online comments to news stories. Comments may get posted automatically and most are signed with pseudonyms. Many are insensitive, even rude, and use speculation and language that would be rejected if written by a staff member or in a letter to the editor. Are news organizations holding true to their ethical guidelines when they publish anonymous reader comments on their Web sites while rejecting them for their hard-copy editions?