Unfortunately, once notification is deleted on Facebook, it is gone forever. The only exception to this is if the user has archived the information, rather than deleting it. In that case, it would still be accessible under the message tab.
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Currently, you cannot recover a deleted post.
You don't. It's gone.
Once a post is deleted, it is not possible to recover it. Always be careful not to delete items you still need. However, if the post is important to an official investigation, authorities may be able to recover the post from the company records.
how can i find deleted messages on facebook
Despite various rumors, there is no way of retrieving deleted messages on Facebook. Immediately after you delete a message in your private Inbox, you are given the option to "Undo" - above the message - but that is it. Once a message is gone, it's gone; there is no way to recover it later.