The only way for you to recover facebook messages is thru the notification email sent to you thru the email account that you are using to login to facebook. Whenever a message was sent to you, you receive a notification email. Notice the part of the email that says:
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Hi there Tam,
The only way for you to recover facebook messages is thru the notification email sent to you thru the email account that you are using to login to facebook. Whenever a message was sent to you, you receive a notification email. Notice the part of the email that says:
To reply to this message, follow the link below :
Click on that link.
After that, click on : Show Deleted Thread.
Hope this works for you.