addFeature() from geoservices-js

Chrome Log

Remote Address:70.37.102.106:80
Request URL:http://services.arcgis.com/OfH668nDRN7tbJh0/arcgis/rest/services/Gnip/FeatureServer/0/addFeatures
Request Method:POST
Status Code:200 OK
Request Headersview source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:3106
Content-Type:application/x-www-form-urlencoded
Host:services.arcgis.com
Origin:http://services.arcgis.com
Referer:http://services.arcgis.com/OfH668nDRN7tbJh0/arcgis/rest/services/Gnip/FeatureServer/0/addFeatures
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36
Form Dataview sourceview URL encoded
features:[ { geometry:
     { x: -11718664.021527646,
       y: 4868120.824612091,
       spatialReference: { wkid: 102100 } },
    attributes:
     { activity_type: 'person',
       actor_type: 'person',
       actor_id: 'id:twitter.com:199774657',
       actor_link: 'http://www.twitter.com/AisforAnne',
       displayName: 'anne gatchell',
       actor_postedTime: '2010-10-07T18:07:45.000Z',
       image: 'https://pbs.twimg.com/profile_images/3686165747/c60b278423510cf47a57c3aec5db1fd7_normal.jpeg',
       summary: 'Artist -- Software Developer @TwitterBoulder/@Gnip -- Lover of Life',
       friendsCount: 433,
       followsCount: 299,
       listedCount: 16,
       statusesCount: 2527,
       timezone: 'Mountain Time (US & Canada)',
       verified: false,
       utcOffset: '-21600',
       username: 'AisforAnne',
       languages: '',
       locationType: 'place',
       location_displayName: 'Boulder, CO',
       favoritesCount: 1238,
       verb: 'post',
       postedTime: '2014-07-29T16:13:39.000Z',
       generator_displayName: 'TweetDeck',
       generator_type: '',
       provider_displayName: 'Twitter',
       provider_link: 'http://www.twitter.com',
       link: 'http://twitter.com/AisforAnne/statuses/494153791051034624',
       body: '@ScottMoorhead @Gnip @TwitterBoulder @ggreenstreet Chamon over and sit with us!',
       object_type: 'note',
       object_id: 'object:search.twitter.com,2005:494153791051034624',
       object_summary: '@ScottMoorhead @Gnip @TwitterBoulder @ggreenstreet Chamon over and sit with us!',
       object_link: 'http://twitter.com/AisforAnne/statuses/494153791051034624',
       object_postedTime: '2014-07-29T16:13:39.000Z',
       twitter_hashtags: '',
       twitter_symbols: '',
       twitter_urls: '',
       twitter_userMentions: '',
       twitter_filter_level: 'medium',
       twitter_language: 'en',
       retweetCount: 0,
       gnip_urls: '',
       gnip_expanded_urls: '',
       gnip_expanded_url_statuses: '',
       gnip_klout_score: 49,
       gnip_language: '',
       gnip_profileObjectType: 'place',
       gnip_profile_geoType: 'point',
       gnip_profile_country: 'United States',
       gnip_profile_countryCode: 'US',
       gnip_country_DisplayName__: 'Boulder, Colorado, United States' } } ]
rollbackOnFailure:false
f:pjson
token:
Response Headersview source
Access-Control-Allow-Origin:*
Content-Encoding:gzip
Content-Length:132
Content-Type:text/plain; charset=utf-8
Date:Wed, 30 Jul 2014 22:30:55 GMT
Server:Microsoft-IIS/8.0
X-Powered-By:ASP.NET
ConsoleSearchEmulationRendering

test.js

var Geoservices = require('geoservices'),
    client = new Geoservices();

var arcGISRecords = [ { geometry:
     { x: -11718664.021527646,
       y: 4868120.824612091,
       spatialReference: { wkid: 102100 } },
    attributes:
     { activity_type: 'person',
       actor_type: 'person',
       actor_id: 'id:twitter.com:199774657',
       actor_link: 'http://www.twitter.com/AisforAnne',
       displayName: 'anne gatchell',
       actor_postedTime: '2010-10-07T18:07:45.000Z',
       image: 'https://pbs.twimg.com/profile_images/3686165747/c60b278423510cf47a57c3aec5db1fd7_normal.jpeg',
       summary: 'Artist -- Software Developer @TwitterBoulder/@Gnip -- Lover of Life',
       friendsCount: 433,
       followsCount: 299,
       listedCount: 16,
       statusesCount: 2527,
       timezone: 'Mountain Time (US & Canada)',
       verified: false,
       utcOffset: '-21600',
       username: 'AisforAnne',
       languages: '',
       locationType: 'place',
       location_displayName: 'Boulder, CO',
       favoritesCount: 1238,
       verb: 'post',
       postedTime: '2014-07-29T16:13:39.000Z',
       generator_displayName: 'TweetDeck',
       generator_type: '',
       provider_displayName: 'Twitter',
       provider_link: 'http://www.twitter.com',
       link: 'http://twitter.com/AisforAnne/statuses/494153791051034624',
       body: '@ScottMoorhead @Gnip @TwitterBoulder @ggreenstreet Chamon over and sit with us!',
       object_type: 'note',
       object_id: 'object:search.twitter.com,2005:494153791051034624',
       object_summary: '@ScottMoorhead @Gnip @TwitterBoulder @ggreenstreet Chamon over and sit with us!',
       object_link: 'http://twitter.com/AisforAnne/statuses/494153791051034624',
       object_postedTime: '2014-07-29T16:13:39.000Z',
       twitter_hashtags: '',
       twitter_symbols: '',
       twitter_urls: '',
       twitter_userMentions: '',
       twitter_filter_level: 'medium',
       twitter_language: 'en',
       retweetCount: 0,
       gnip_urls: '',
       gnip_expanded_urls: '',
       gnip_expanded_url_statuses: '',
       gnip_klout_score: 49,
       gnip_language: '',
       gnip_profileObjectType: 'place',
       gnip_profile_geoType: 'point',
       gnip_profile_country: 'United States',
       gnip_profile_countryCode: 'US',
       gnip_country_DisplayName__: 'Boulder, Colorado, United States' } } ];

var featureServiceURL = 'http://services.arcgis.com/OfH668nDRN7tbJh0/arcgis/rest/services/Gnip/FeatureServer/0';

var featureService = new client.featureservice({
      url: featureServiceURL
    }, function(err, metadata) {
      if (err) {
        console.error('ERROR connecting to Feature Service: ' + err);
      } else {
        console.log('Posting Test');
        debugger
        featureService.add({features: arcGISRecords}, function(err, data) {
          debugger
          if (err) {
            console.error(err);
          } else {
            console.log('Wrote features OK!');
          }
        });
      }
    });

you have to get a token to manipulate data
https://gist.github.com/nixta/3427ba6280b8f531ff43#file-chrome-log-L75

I think I've confused things. That file is the output from the Chrome debugger to show that using the HTML page on the feature service works with the same JSON object being written. There is no token in that request, and the request succeeds. I thought you needed a token too, but that tells me you don't (this service is public).