Jetpack: Apply Default Image

/**
 * Apply Default Image for Jetpack
 * When looking for images in posts that falls under "is_singular"
 * and Jetpack does not find an image, we apply our own default image
 * instead of the blank WordPress thumb.
 * @version 1.0
 */
add_filter( 'jetpack_images_get_images', 'apply_default_image_for_jetpack_seo', 10, 3 );
function apply_default_image_for_jetpack_seo( $media, $post_id, $args ) {
    // Jetpack_PostImages::get_images did not find anything
    if ( ! $media && is_singular() ) {
        $media = array();
        $media[] = array( 'src' => 'http://site.com/default.png' );
    }
    return $media;
}