How to delete all message from facebook fan page at once.

Step one
Install FireFox if you don’t have on your pc.

Step Two
Install Grease Monkey add on.


Step Three
Click on "Add to Firefox" to install the addon.
Restart firefox

Step Four
Go to userscripts.org and search for "facebook messages"


Step Five
Select Delete facebook messages


Step Six
Click the green install at the top right.


Step Seven
Click delete All messages at the top of the message list


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