By default Facebook will notify you if someone has accepted your friend request or someone have sent you a friend’s request. But the same does not apply when someone removes/deletes/unfriend you from his or her friends list. Unfortunately most of the times we don’t get even a hint of this till one day we come across the profile or search for the particular friend for any reason.
Who deleted me is a Facebook app just made for the purpose, with this app you will get to know who removed you from his or her list.
How who deleted me work?
It keeps track of your friendships and anytime something changes they sends you an alert email so you can check who did what.
Well so if are someone concerns about your friends inside Facebook list and want to keep a track, Who Deleted Me is great service.
You can get it here: Who Deleted Me. (Note: This is a Facebook app and you need to allow access in Facebook)