Meteor React LoginWithTwitter Component

meteor-login-with-twitter.jsx

var LoginWithTwitter = React.createClass({
    getInitialState: function() {
      return {loggedIn: false};
    },

    login: function  (e) {
      var that = this;
      Meteor.loginWithTwitter(function() {
        that.setState({ loggedIn: true });
      });
    },

    logout: function  () {
      var that = this;
      Meteor.logout(function() {
        that.setState({ loggedIn: false });
      });
    },

    render: function() {
      if (this.state.loggedIn) {
        var twitterUser = Meteor.user().services.twitter;

        return(
          <div>
            <a href={ "https://twitter.com/" + twitterUser.screenName } >
              <img src={ twitterUser.profile_image_url } />{ twitterUser.screenName }
            </a>
            <a onClick={ this.logout }>Logout</a>
          </div>
        );
      } else {
        return(
          <a onClick={ this.login }>
            Login
          </a>
        );
      }
    }
  });

  React.renderComponent(
    <LoginWithTwitter />,
    document.getElementById('login-with-twitter')
  );