code: public function getTaggedPosts($tag, $options = null)
      {
          if (!$options) {
              $options = array();
          }
          $options['tag'] = $tag;
  
          return $this->getRequest('v2/tagged', $options, true);
      }
docs: Get tagged posts
  
  @param string $tag     the tag to look up
  @param array  $options the options for the call
  
  @return array the response array