A privacy policy can be as short and sweet as "We won't give your information away. We collect your address for our own use only." through to a longwinded explanation of exactly how you will or will not use the email addresses or personally identifying information that you collect.

If you have any plans to share or sell the information you gather on your website, please contact an attorney about how to phrase your privacy policies, and to make sure your intended use of the information is not in violation of the CANN-SPAM act, or other laws that you are held to.