Trying to inject dynamic facebook meta tags through nodejs-express

Hey so I am trying to inject my site with the facebook og:meta-tags. I am using express and this library: http://ift.tt/1NafN87

It seems east, but I can't get it to work.

I have my client-side written separately from my server. And I have node-js hosting my server (mainly for heroku).

My server is all this:

var express = require('express');
var morgan = require('morgan');
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var OG = require('express-metatag')('og');

var app = express();
var port = process.env.PORT || 3000;
var router = express.Router();

//-----------------------------------------
//  set the static files location 
//  for the static html
//-----------------------------------------
app.use(express.static(__dirname + '/dist')); 
app.use(express.static(__dirname + '/dist/views'));

app.use(morgan('dev'));     // log every request to the console
app.use(bodyParser());      // pull information from html in POST
app.use(methodOverride());  // simulate DELETE and PUT
app.use(OG([{
        title: 'Hello World',
        description: 'Amazing module'
    }]);
router.get('/', function(req, res, next) {
    res.render('index.html');
});

app.use('/', router);

app.listen(port);
console.log('App running on port', port);

I have no clue how the server-hosting works here, so treat me like a total newbie... This currently does not work.