How to check secret messages on facebook

How to Install Facebook Marketplace Nearby Me App, How to Make Facebook Fan Page, How to Delete All Facebook Search History on FB , How to Login Instagram with Your Facebook , Marketplace Facebook Buy and Sell within Local Community Marketplace Facebook Buy Sell , How to Deactivate FB Account Temporarily on Facebook, How to Find Blocked Facebook List to Unblock blocked Friends , How to Use the Nearby Me Friends FB Feature on Facebook , Facebook Customer Care Center & Email Help Supports Contact Addresses , How to Install Facebook Farmville Games

Mark Zuckerberg, founder and CEO of Facebook.REUTERS/Adnan Abidi

There's a secret folder on Facebook Messenger containing messages that you probably didn't know existed.
Some of them can be vitally important, with one Facebook user, Daniel Emery, only discovering his friend had died after checking this folder.
When you receive a message from someone on Facebook who isn't your friend, Facebook alerts you to let you know. But the social-media network doesn't do this for every message you receive from a non-Facebook friend.
If Facebook thinks the message is spam, it will tuck it away into a hidden vault.
Several Business Insider journalists found the vault, and all of us had messages in there that we didn't know we had ever received.