This wikiHow teaches you how to view Facebook messages from someone who isn't your friend on Facebook.
Step
Step 1. Launch Messenger
The icon is a blue conversation bubble with a white flash in the app drawer or home screen.
Step 2. Sign in to Messenger
If you are not logged in, enter the phone number, touch Continue, then type in the password.
Step 3. Touch the Address Book icon
The icon is three horizontal lines, with a dot at the start of each line, in the lower-right corner of the Messenger screen.
Step 4. Touch Message Requests
It's next to the blue conversation icon with three white dots inside. Messages from people who are not connected to you on Facebook will be displayed.