function install() {
    global $wpdb;

    $charset_collate = '';
    if ( version_compare(mysql_get_server_info(), '4.1.0', '>=') ) {
      if (!empty($wpdb->charset)) {
        $charset_collate .= " DEFAULT CHARACTER SET $wpdb->charset";
      }
      if (!empty($wpdb->collate)) {
        $charset_collate .= " COLLATE $wpdb->collate";
      }
    }
    $result = $wpdb->query("
      CREATE TABLE `$wpdb->aktt` (
      `id` INT( 11 ) NOT NULL AUTO_INCREMENT PRIMARY KEY ,
      `tw_id` VARCHAR( 255 ) NOT NULL ,
      `tw_text` VARCHAR( 255 ) NOT NULL ,
      `tw_created_at` DATETIME NOT NULL ,
      `modified` DATETIME NOT NULL ,
      INDEX ( `tw_id` )
      ) $charset_collate
    ");
    foreach ($this->options as $option) {
      add_option('aktt_'.$option, $this->$option);
    }
    add_option('aktt_update_hash', '');
  }