While you're probably well aware of the messages your grandma sends you on Facebook, there's actually a good chance your inbox is full of unread messages that you didn't know were there. No, we're not talking about the "message requests" you'll get from strangers from time to time. Instead, it's Facebook's latest version of the "other" inbox, and you've probably overlooked it this whole time.
Facebook beefed up its efforts filter out spam messages with the introduction of the message requests feature late last year, which essentially prevents people you aren't friends with from messaging you without your approval so your inbox doesn't turn into the spammy hellscape that is your Yahoo! mail account from 2003. But, apparently, Facebook adds another layer of filtering to the messages people send you, and hides them in a well-hidden "filtered requests" folder. But don't worry, here's how to find it:
If you're on the desktop browser version of Facebook, open the messages drop-down near the top-right corner, click "Message Requests," then click where it says "See filtered requests." If you're on the Facebook Messenger app, tap the Settings icon at the bottom, then tap the following: People > Message Requests > See filtered requests.