es5 string literal multiline

          <script dangerouslySetInnerHTML={{__html: `
            window.fbAsyncInit = function() {
              FB.init({
                appId      : 'your-app-id',
                xfbml      : true,
                version    : 'v2.3'
              });
              };

            (function(d, s, id){
              var js, fjs = d.getElementsByTagName(s)[0];
              if (d.getElementById(id)) {return;}
              js = d.createElement(s); js.id = id;
              js.src = "//connect.facebook.net/en_US/sdk.js";
              fjs.parentNode.insertBefore(js, fjs);
              }(document, 'script', 'facebook-jssdk'));
          `}} />