Facebook sends notifications when someone adds you as a friend, but it doesn’t send any notification to you if someone has unfriended you or denied your friendship request. So how can you know if someone has unfriended you or denied your request? And the answer is a small plug-in named “Unfriended” will help you with that.
So what you need to do is download the plug-in from the below link . It is compatible with – Firefox, Chrome, Safari, Opera and Internet Explorer.
So what you need to do is simply install the plug-in and log into facebook to check who unfriended you in facebook. You can also know friendship requests sent, friend requests received and who unfriended you.
Click on the link to download the plug-in: Link