The Facebook inbox lets friends send messages to one another (privately). If you friend request someone, then that person can

The top of Facebook's page.

message you through the inbox without even being your friend yet. This method of communicating would be instead of Wall to Wall messaging. The Inbox was a more commonly used feature back in the earlier days when you wanted a message that was more personal or private.

The record for the most inbox messages is 1829.

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