Bloggers main problm is Spam comments, so here is a way to block spam comments using a simple code. with the help of this code , it will remove the website field from your wordpress blog. 
To remove the website field from the comment form, paste the below code into your functions.php file.
functionremove_comment_fields($fields) {unset($fields['url']);return$fields;}add_filter('comment_form_default_fields','remove_comment_fields');
For Genesis Framework Users
if you are using Genesis theme then paste the below code in your functions.php file. (the functions.php file can be found in your child theme)
add_filter('genesis_comment_form_args','url_filtered');add_filter('comment_form_default_fields','url_filtered');functionurl_filtered($fields) {if( isset($fields['url'] ) )unset($fields['url'] );if( isset($fields['fields']['url'] ) )unset($fields['fields']['url'] );return$fields;}
For Thesis Users
To hide the website field with css, please paste the below code in your custom.css file
.custom #commentform input[name="url"], .custom #commentform label[for="url"] { display:none; }
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