Add twitter and reddit buttons:

_includes/reddit-this.html

@@ -0,0 +1,6 @@
+<script type="text/javascript" src="http://www.reddit.com/static/button/button1.js">
+  reddit_title = "{{ post.title }}";
+  reddit_url = "{{ site.url }}{{ post.url }}";
+  reddit_newwindow = '1';
+  reddit_bordercolor = "#FFFFFF";
+</script>

_includes/twitter.html

@@ -0,0 +1,4 @@
+<script
+type="text/javascript"
+src="http://platform.twitter.com/widgets.js"></script> 
+

_layouts/post.html

@@ -14,6 +14,7 @@ layout: default
 
 {% include reddit-this.html %}
 
+<br/>
 <br/>
 
 <div id="related">