Facebook has a secret folder is full of messages you consider your users will not see.
Last year, the company renewed its Messenger service to get rid of the old system, which categories of messages that people want to see in a "inbox" and "Other". It was exchanged instead of the normal messages and a folder called "message" Application - a place where foreigners can ask to contact users.
But there is another folder that keeps people to see all the messages
that have been sent. The hidden messages in a special folder called "filtered message requests" and the name refers to the fact that it seems to use technology to hide messages that you think people will not see.
It can be found by opening the Messenger application and going to the Settings tab at the bottom. There, you will find a choice of "People" - click it, select "Requests Messages" and select the option to view "filtered requests."
