use to be able to delete it, but not anymore.
guessing they want to keep track of what people do.
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It is possible to delete notifications on Facebook, by clicking the globe at the top of the search bar. Next, click the X on the right of the notification to delete it.
Facebook should not have offers popping up on the screen. If this is happening updating the application may be useful.
No
In Facebook there is a notation for new messages. After viewing these messages it is possible to delete them individually or return to the list and delete all. This is done by using the corner x.
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.