How to find out if someone unfriended you on Facebook

Who Deleted Me

A glimpse of the Who Deleted Me app interface.

If you've ever been curious why your Facebook friend count was down, there's now an app that tells you who exactly unfriended you.

The free app for iOS and Android is called Who Deleted Me, and was spotted by Rachel Zarrell at BuzzFeed. It also is a browser extension for Google Chrome.

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It works by simply saving a copy of your friend list after you first use Who Deleted Me.

Who Deleted Me

Who Deleted Me tells you who your missing friends are as well as who recently became your Facebook friend.

When you revisit the app or browser extension, it will then compare your current friend list to the saved version - which unfortunately means you can't see who unfriended you back in 2012.

It will then give you a list of who stopped being your friend on Facebook as well as any new friends since the last time you were logged on.

Both the app and browser extension will distinguish if you were the one to delete a friend and if someone merely deactivated their Facebook profile. Here's a mock up of what the app looks like:

Who Deleted Me

The app lets you see who deleted you, who you deleted, and who deactivated their account.

The app and website became so popular this week that the website began running slower on Monday and eventually suffered some outages. Who Deleted Me has since said it has updated to bigger servers to cover the increased traffic.

Website outages aren't the only concern for the new app. Back in February, the app's creator Anthony Kuske received a notice from the Facebook Team telling him that his app and browser extension were creating a negative user experience:

But currently, 36,000 people have liked the Who Deleted Me app page on Facebook and counting, so there's obviously a marketplace for it.

The app is not the first of it's kind. There's been a browser extension since last year called Unfriend Notify that has roughly the same service, and there's also a Twitter version called WhoUnfollowedMe? as well.

So the next time you're debating unfriending your aunt who sends all those FarmVille requests, now you might want to think twice.

To install the Who Deleted Me Google Chrome extension or see how it works, visit the website here.