I'll repeat - in most cases, we use the "soft delete" feature, meaning that moderators still have access to the content. That is definitely true if you see the thread title with the comment, "deleted at OP's request". Thus, if you have made an information-rich post in a thread that got deleted due to the bad behavior of others, you can ask the moderators (via the "Contact Us" link) to retrieve your post for you so you can start your own thread with that info.
Edit: Looks like Rick and I were composing at the same time.
Bookmarks