diff --git a/index.html b/index.html
index b128f91..d603423 100644
--- a/index.html
+++ b/index.html
@@ -51,25 +51,7 @@
     </div>
 
     <div id="footer">
-      <ul id="shareLinks">
-        <li class="google">
-<!-- Place this tag where you want the share button to render. -->
-<div class="g-plus" data-action="share"></div>
-
-<!-- Place this tag after the last share tag. -->
-<script type="text/javascript">
-  (function() {
-    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
-    po.src = 'https://apis.google.com/js/plusone.js';
-    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
-  })();
-</script>
-        </li>
-        <li class="twitter"><a href="https://twitter.com/share" class="twitter-share-button" data-url="http://markdownlivepreview.com" data-via="tanabe">Tweet</a>
-        <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script></li>
-        <li class="facebook"><iframe src="//www.facebook.com/plugins/like.php?href=http%3A%2F%2Fmarkdownlivepreview.com&amp;send=false&amp;layout=standard&amp;width=450&amp;show_faces=false&amp;font=tahoma&amp;colorscheme=dark&amp;action=like&amp;height=35" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:35px;" allowTransparency="true"></iframe></li>
-      </ul>
-      <div id="copyright">Copyright 2015 <a href="https://twitter.com/tanabe">tanabe</a>.</div>
+      <div id="copyright">Copyright 2018 <a href="https://twitter.com/tanabe">Hideaki Tanabe</a>.</div>
     </div>
 
     <script type="text/javascript">