The question has come up, more than once, over why newspapers insist on names and contact details for Letters to the Editor, but do not for texts, or comments to their websites or Facebook pages.
It's not a perfect situation. It reflects the tension of the evolution of the digital age and how it interacts with traditional media. It boils down to understanding the nature and culture of each of the forums, and accepting the flaws for the reward of encouraging debate and freedom of speech.
The formality of letters is old-fashioned, where those with robust opinions were expected to put their name to them. In return, newspapers byline editorials and reporters byline their work.
Texts are a difficult forum, because they are utterly anonymous. But with only 140 characters, it is an "off-the-cuff" forum with less potential for harm - although we certainly weed out abuse and defamation.
Facebook has far greater scope for comment and risk, because we post-moderate (check the comments after they go up). People appear to be honest about their names. Barring some pseudonyms, the public know who is commenting.