How To Restrict Friend On Facebook
1. Login to Facebook and go to the Account drop-down menu at the top of any Facebook page and select "Privacy Settings."
2. Select "View settings" in the "Fundamental Directory Information" section.
3. Modification the setting for "Send me messages." Your choices include Everybody, Friends and Pals of Buddies.
Only emails from people that fall within the message privacy setting you pick will be provided to your Facebook Messages. For example, if you select the "Friends Just" setting, you will not receive messages from email addresses that are not confirmed to be among your friends. Rather, those senders will receive automatic bounce-back replies.
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