Facebook Messenger has a secret folder for storing 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.
Here's how to find the secret vault:
1. Open the Facebook Messenger app.
2. Tap "Settings" in the bottom right-hand corner.
3. Select the "People" option.
4. And then "Message Requests."
5. Tap the "See filtered requests" option, which sits under any existing requests you have.
6. And here you have it — a little-known place on Facebook Messenger full of unread messages.
Enjoy the treasure trove of messages that you never knew you had!
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