code: function _linkIdentity() {
      var identityOptions = {
              id: this.socialUserInfo.id,
              accessToken: this.params.access_token,
              screen_name: this.socialUserInfo.username
          };
  
      return BB.resolve(grasshopper.request(this.token).users.linkIdentity(this.user._id.toString(), 'pinterest', identityOptions));
  }
docs: Utility function to link a user's pinterest info to the current user.