Did you know you may be missing out on Facebook messages? They're hidden in your Filter Folder. Here's how to access it:
Desktop:
Messages > See All > More > Filtered
Mobile:
Settings > Message Requests > See Filtered Requests
VOILA! While this feature is good for filtering out SPAM messages, some legit messages can get stuck in it. Be sure to check it often so you don't miss out on any messages.