code: function _createSocialAccount(){
      return BB
          .bind(this)
          .then(function() {
              return grasshopper.auth('Pinterest', this.params);
          })
          .then(function(token) {
              this.req.session.token = new Buffer(token).toString('base64');
              this.req.session.save();
          });
  }
docs: Function that will create a user in our system. the `auth` function will auto-create a user if there is not already one in the system.