So an express based route:

app.all('/:label/:mode/*',
  ensureAuthenticated,
  function(req, res) {
    console.log(req.session);
    
    //forcedotcom
    if(req.session["forcedotcom"] && req.params.label == "fdc") {
      var restOptions = {
        useHTTPS : true,
        host : req.session["forcedotcom"].instance_url.replace('https://',''),
        headers: {
            'Authorization': 'OAuth '+req.session["forcedotcom"].access_token,
            'Accept':'application/jsonrequest',
            'Cache-Control':'no-cache,no-store,must-revalidate'
          }
      }

      lazyproxy.send(restOptions,req,res);
    }

    //facebook
    if(req.session["facebook"] && req.params.label == "fb") {
      var restOptions = {
        useHTTPS : true,
        host : 'graph.facebook.com',
        headers: {
            'Authorization': 'OAuth '+req.session["passport"]["user"].access_token,
            'Accept':'application/jsonrequest',
            'Cache-Control':'no-cache,no-store,must-revalidate'
          }
      }

       lazyproxy.send(restOptions,req,res);
    }

  });

Would allow an application to forward those routes to Force.com and Facebook. Where:

/fdc/json/services/data/v22.0/query?q=SELECT%20ID%20FROM%20Account

Would send the result of SOQL callout directly back as json,

/fdc/view/account/services/data/v22.0/sobjects/Account/{accountId}

Would call render("account",{accountdata}) instead.