Hello,
Facebook users can start to improve the protection on their email addresses by not sharing that information.
Go to Account in the top right of your facebook and click Privacy Settings :

Click on Customize Settings :

Set your Contact Information to Only Me :

Additional discussion on the Facebook Messaging system can be found here - http://www.emailquestions.com/email-articles/2723-facebook-email-social-messaging.html
Facebook users can start to improve the protection on their email addresses by not sharing that information.
Go to Account in the top right of your facebook and click Privacy Settings :

Click on Customize Settings :

Set your Contact Information to Only Me :

Additional discussion on the Facebook Messaging system can be found here - http://www.emailquestions.com/email-articles/2723-facebook-email-social-messaging.html