To prevent spam comments plugin blocks the default action path (wp-comments-post.php) for bots and make it accessible over unique hash query string when a visitor scroll to leave a comment. This way it prevents automated spam comment done by bots.
Flying Pages for WordPress
Forget Spam Comment
Forget Spam Comment
Forget Spam Comment
Forget Spam Comment
Forget Spam Comment
Forget Spam Comment
Forget Spam Comment
