I am currently a moderator at two forums and a user of quite a few. In each of the forums I moderate, we never edit a post, but we most certainly delete posts for a variety of reasons as well as move them to more appropriate locations. We always notify the poster of a deletion or move. It's built into the software running the forum. I have been on forums that edit posts. Personally, I don't like it to ever have my posts edited. I would much rather have my posts just deleted if they somehow violate the rules of the forum, as I've seen edits by moderators that go too far, so much so the poster deleted them after the moderator edit.