What would good update mechanisms be? Is there any today, except "Follow this newspaper forever" and "Hope they do honest retractions"? One idea.. A system att

What would good update mechanisms be? Is there any today, except "Follow this newspaper forever" and "Hope they do honest retractions"? One idea.. A system attaches to every article an ID, users read the article and the reader saves the ID for the user and the system later informs him of retractions and critiques, if desired?