The use of web browser add-on/extension
- Mount the add-on or extension plugins onto your web browser preferably Firefox or chrome browsers
- Then login using the browser into your Facebook account
- Wait until your friends list is up to date, uploading them might take up to 3 min depending on how plenty your friends are
- The browser will continue to notify you whenever some unfriends you on Facebook
- But to detect those that have unfriended you before, simply go friends, then click on lost friends
- The displayed list of friends are those who have unfriended you.
Check this: Why can’t I update Facebook?
The use of a 3rd party site
- Simply open www.who.delete.me on any browser
- On this site, login to your Facebook account and enable crucial authorization
- When successfully logged in, a list of those that unfriended you on Facebook is displayed
See also: Download Facebook Lite update
Now you see it extremely easy to detect that friend of yours who backslides and broke the oath by unfriending you on Facebook. Since this article has helped you acquire that, why not share it with those loyal friends, so they can also detect their disloyal friends.