gistfile1.txt

function jeherve_multiple_images_pinterest( $url ) {
    global $post;
 
    if ( ! $post ) {
        return $url;
    }
 
    $url = '//www.pinterest.com/pin/create/button/?url=' . rawurlencode( get_permalink( $post->ID ) ) . '&description=' . rawurlencode( $post->post_title );
 
    return $url;
}
add_filter( 'jetpack_sharing_pinterest_share_url', 'jeherve_multiple_images_pinterest' );