Filter: shared_counts_link_url Tutorial

If you need the entire URL including query string, you can do that using the filter:

/**
 * Add query string to share links
 *
 * @param string $link
 * @return string
 */
function dig_full_share_url_share_link($url) {
    return $url . urlencode("?" . ($_SERVER['QUERY_STRING']));
}
add_filter( 'shared_counts_link_url', 'dig_full_share_url_share_link' );