code: function(seriesCallback) {
                  async.eachLimit(groupedPinIds, 50, function(groupOfPinIds, eachCallback) {
                      var pinIdsString = groupOfPinIds.join(',');
                      getCache(pinIdsString, true, function (cacheData) {
                          if (cacheData === null) {
                              get('http://api.pinterest.com/v3/pidgets/pins/info/?pin_ids=' + pinIdsString, true, function (response) {
                                  putCache(pinIdsString, JSON.stringify(response));
                                  allPinsData = allPinsData.concat(response.data ? response.data : []);
                                  eachCallback();
                                  return;
                              });
                          } else {
                              allPinsData = allPinsData.concat(cacheData.data ? cacheData.data : []);
                              eachCallback();
                              return;
                          }
                      });
                  }, function (err) {
                      if(err) {
                          throw err;
                      }
                      seriesCallback();
                      return;
                  });             
              }
docs: get pin data from API