[Steven Zahm]

@ Rich

Something like this would be safer:

add_action( 'admin_init', 'cn_remove_metaboxes' );

function cn_remove_metaboxes() {

    if ( class_exists( 'cnMetaboxAPI' ) ) {
        cnMetaboxAPI::remove( 'metabox-logo' );
        cnMetaboxAPI::remove( 'metabox-messenger' );
        cnMetaboxAPI::remove( 'metabox-social-media' );
        cnMetaboxAPI::remove( 'metabox-links' );
        cnMetaboxAPI::remove( 'metabox-date' );
    }
}