How do you delete a friend on facebook without them knowing

Can someone tell if you unfriend them on Facebook? A person does not receive any type of notification if you unfriend them on Facebook; you will just be removed from that person's friend list. If that person looks at their list of friends, they may notice that you are not in it anymore.

However, the general rule of thumb is to unfriend people you don't want to see/engage on your feed, leaving open the door of future communication. On the other hand, block people when you need them in a position where they can never make future contact with you on Facebook (except they do so with another account).