With Mobile Tracker Free you can monitor conversations from Facebook messaging.
You will be able to monitor the conversations Facebook Messenger of your child or your employees. This will help you keep them safe from external threats.
If the phone is not rooted, the application will retrieve the messages received in the notification bar and the messages sent via the accessibility of the phone.
To do this, the phone must be correctly configured. See video YouTube for more explanations.
It is still better if the phone is rooted to be sure to retrieve all Facebook messages.