code: function setupStrategies(auth) {
      var result = {};
      if (auth.maintenance === 'token') {
        result = {
  
          facebook: require('passport-facebook').Strategy,
          twitter: require('passport-twitter').Strategy
        };
      } else {
        result = {
          google: require('passport-google-oauth').OAuth2Strategy,
          facebook: require('passport-facebook').Strategy,
          twitter: require('passport-twitter').Strategy
        };
      }
      return result;
    }
docs: setup strategies that we can use google OAuth2Strategy requires session, which we do not setup if using token