You can't. They disappear after a short period of time.
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The Facebook notifications on the iPhone will disappear after one clicks on them. This is the only way to get rid of them once they are delivered. To stop receiving notifications, one can log into Facebook and change the settings in "Mobile" under the "Settings" menu.
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.
To access Facebook, you must first have an account. Once you have registered an account with Facebook, you can then login with your specified credentials.
Reactivate your Facebook account only if you once deactivated it.You will only need to activate your account if you once deactivated it. Follow the following steps to reactivate your Facebook account:1. Log into Facebook with your Facebook username and password2. Check the email address used in registering the Facebook account for a reactivation confirmation mail3. Follow the link in the confirmation mailAfter all is done, your Facebook id is reactivated automatically
If your Facebook profile gets hacked ask your 10 friends to report it. Once the reporting is done Facebook reviews the report and suspend the profile from their database.