I was thinking if this could be a good strategy. Sometimes we would like to place a nice post in a forum containing a link to a certain site. But we know that the forum is either moderated or we know that we wouldn't get past the admin's check against spamming. In this case we could try placing a legitimate post without any links, receive all the admin's attention, maybe some answers from other members and than after some days, we could edit the message adding the link and modifying content. On certain platforms (I'm quite sure phpBB) your edited post will not be flagged as recent and it might be a good way to get your link through.