I found that the following worked:
Blackberry 9000 v 4.6.0.162 / Facebook app 1.9.0.28
No, he or she won't receive a notification, but you will disappear from the Friend list.
When the little bubble pops up saying "You sent a notification to..." click undo. It should undo the sending of the notification.
use to be able to delete it, but not anymore. guessing they want to keep track of what people do.
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.
You can't. They go away after you reply to them or click on them. If you want to stop getting them you can look under settings.
You can delete the post from your wall, by clicking the icon on the right side. Then press delete post at the bottom of the list. If you don't want people to keep sending you requests for questions you can block them when you next get an app notification.
the notification of science
You can't delete the red numbers because it means the app has some sort of notification. For example if the app store app has a red number on it it means that there is an app that needs to be updated. So the only way to get rid of the number is to check up on the app.
They will not receive a notification that the comment was deleted. However, if that person went back to the page the comment was posted on, it's possible they will notice the comment was deleted.
He got a notification by e-mail.
Depends. After a while, a lot of mail servers will delete dormant accounts, at which point, they can no longer receive emails. You'll get a delivery failure notification email when this happens.
If you click on your notifications icon in the top left side of the page, you should see "see all notifications" as an option at the bottom. Click on it and you will come to a page with all your notifications. You can then delete the ones you want using the x that appears when you hover your curser on the right.