Post on a facebook page.

fb_page

var request = require('request');

function postMessage(access_token, page_id, message, response) {
    // Specify the URL and query string parameters needed for the request
    var url = 'https://graph.facebook.com/' + page_id + '/feed';
    var params = {
        access_token: access_token,
        message: message
    };

  // Send the request
    request.post({url: url, qs: params}, function(err, resp, body) {
      
      // Handle any errors that occur
      if (err) return console.error("Error occured: ", err);
      body = JSON.parse(body);
      if (body.error) return console.error("Error returned from facebook: ", body.error);

      // Generate output
      var output = '<p>Message has been posted to your feed. Here is the id generated:</p>';
      output += '<pre>' + JSON.stringify(body, null, '\t') + '</pre>';
      
      // Send output as the response
      response.writeHeader(200, {'Content-Type': 'text/html'});
      response.end(output);
    });

}

var token   = 'blablabla'
  , page_id = '12345'
  ;
postMessage(token, page_id, 'test', null);