Sometimes, there's things that are best left unknown.

Much like your balance at the end of the month or what your ex is up to, it's one of those things that your life isn't vastly improved by that knowledge.

So, with that in mind, there's a new app that'll show you who's deleted you from Facebook.

The app, aptly titled (heh) Who Deleted Me, works on iOS, Android and as a browser extension on Google Chrome.

There's various copies of the same idea on Twitter, but this is the first time there's been a Facebook version.

However, the app only works from the date you downloaded the app - so if you're wondering if that certain someone deleted you recently or ages ago, no such luck.

What's more, the app also tracks to the minute the last time your friends were online - so that'll help with the Facebook stalking.

The real question is - would you actually WANT to know?