If you want to post a comment your email and IP is stored in the database.
This data is not used at all unless I want to block you!
Under the new EU Directive it’s only right you know what cookies are used on the site as these are used for Google Analytics and to allow WordPress to function properly.
For use of Google Cookies see this link https://developers.google.com/analytics/resources/concepts/gaConceptsCookies#HowGAUsesCookies
For use of WP cookies see this link http://codex.wordpress.org/WordPress_Cookies