Edited articles (whether the title, URL or anything else was changed) should at least show who edited it, when, and what the previous content was. Then you can see that the username associated with the post did not really write that content (making it more authentic), and any comments relating to previous titles/URLs can still be understood by seeing the previous content (making it more relevant).
Comments
Edited articles (whether the title, URL or anything else was changed) should at least show who edited it, when, and what the previous content was. Then you can see that the username associated with the post did not really write that content (making it more authentic), and any comments relating to previous titles/URLs can still be understood by seeing the previous content (making it more relevant).