If are doing serious blogging and stable as professional blogger than you should avoid all the major things which take down of your post and article.
When you post useful and informative article on your blog and it's become popular you received many comments everyday. Comments increase your passion and encourage to write more article but spam comments and links forward your users to another websites and it's every spam down your hard work which you wrote.
Due to all kind of these problem I decide to share a simple and easy way by applying you can block spam comments and links.

Open your functions.php and paste below code :

function dez_remove_post_author_weburl($return) {
global $comment, $post;
if( !is_admin() ): //only run outside dashboard 
if ( $comment->user_id == $post->post_author ) {
$author = get_comment_author( get_comment_ID() );
$return = $author; //return post author display name only
return $return;
} else {
return $return; //return default
}
endif;
}
add_filter( 'get_comment_author_link', 'dez_remove_post_author_weburl');

If above code not work with your WordPress, don't worry download a small plugin Remove Links From Comment from below and install.

Download Now no one can spam you entering website in comment is disabled. Enjoy !