var RevealEmbedTweet = window.RevealEmbedTweet || (function(){
	var ready = false;
	window.twttr = (function(d, s, id) {
		var js, fjs = d.getElementsByTagName(s)[0],
				t = window.twttr || {};
		if (d.getElementById(id)) return t;
		js = d.createElement(s);
		js.id = id;
		js.src = "https://platform.twitter.com/widgets.js";
		fjs.parentNode.insertBefore(js, fjs);

		t._e = [];
		t.ready = function(f) {
				t._e.push(f);
		};
	}(document, "script", "twitter-wjs"));


	function load() {
		if ( twttr != undefined && !document.querySelector('section[data-markdown]:not([data-markdown-parsed])') ) {
			tweets = document.querySelectorAll(".tweet");
			for (i = 0; i < tweets.length; ++i) {
				tweets[i].style.cssText = "margin: 0;position: absolute; left: 50%;transform: translate(-50%,0%);" + tweets[i].style.cssText;
				tweets[i].innerHTML = 	'<blockquote class="twitter-tweet" data-lang="en"><a href="' + tweets[i].getAttribute('data-src') + '">Tweet</a></blockquote>';
			}
			twttr.widgets.load()
		}
		else {
			// wait for markdown to be loaded and parsed
			setTimeout( load, 100 );
		}
	}

	Reveal.addEventListener( 'ready', function( event ) {
		load();
	} );


})();





var RevealEmbedTweet = window.RevealEmbedTweet || (function(){
	var ready = false;
	window.twttr = (function(d, s, id) {
		var js, fjs = d.getElementsByTagName(s)[0],
				t = window.twttr || {};
		if (d.getElementById(id)) return t;
		js = d.createElement(s);
		js.id = id;
		js.src = "https://platform.twitter.com/widgets.js";
		fjs.parentNode.insertBefore(js, fjs);

		t._e = [];
		t.ready = function(f) {
				t._e.push(f);
		};
	}(document, "script", "twitter-wjs"));


	function load() {
		if ( twttr != undefined && !document.querySelector('section[data-markdown]:not([data-markdown-parsed])') ) {
			tweets = document.querySelectorAll(".tweet");
			for (i = 0; i < tweets.length; ++i) {
				tweets[i].style.cssText = "margin: 0;position: absolute; left: 50%;transform: translate(-50%,0%);" + tweets[i].style.cssText;
				tweets[i].innerHTML = 	'<blockquote class="twitter-tweet" data-lang="en"><a href="' + tweets[i].getAttribute('data-src') + '">Tweet</a></blockquote>';
			}
			twttr.widgets.load()
		}
		else {
			// wait for markdown to be loaded and parsed
			setTimeout( load, 100 );
		}
	}

	Reveal.addEventListener( 'ready', function( event ) {
		load();
	} );

	this.refresh = load;

	return this;
})();





Allow user to add tweet and refresh (untested)