I've seen differing reports on this question and would like to get to the bottom of it. While some say (including myself, having tested it with my two Facebook accounts) that no notifications are sent out after someone edited their existing comment, there are those who have received one
(https://www.quora.com/Does-editing-a-comment-on-Facebook-send-out-a-notification/answer/Elling-Lien, https://www.quora.com/Does-editing-a-comment-on-Facebook-send-out-a-notification/answer/Elling-Lien/comment/14026784).
One person claims it only happens if the original comment was posted while the post's author was offline.
What are your experiences? How can this Facebook behavior be officially ascertained?