diff -u b/sharethis.js b/sharethis.js
--- b/sharethis.js
+++ b/sharethis.js
@@ -1,9 +1,9 @@
 (function($) {
   Drupal.behaviors.sharethis = {
     attach: function(context) {
-      $('.sharethis-wrapper button').keypress(function (e) {
+      $('.sharethis-wrapper span').keyup(function (e) {
         // The enter key code (13).
-        if (e.which == 13) {
+        if (e.which == 13 || e.which == 32) {
 
           // Find innermost span
           var $target = $(this).children('span');
diff -u b/sharethis.module b/sharethis.module
--- b/sharethis.module
+++ b/sharethis.module
@@ -590,6 +590,8 @@
       'st_title' => $title,
       'class' => 'st_' . $display . $type,
       'style' => 'background:none; border:none; padding:none;',
+      'role' => 'button',
+      'tabindex' => 0,
     );
     if ($serviceCodeName == 'twitter') {
       if (!empty($data_options['twitter_handle'])) {
@@ -604,7 +606,7 @@
     // Render the span tag.
     $st_spans .= theme('html_tag', array(
       'element' => array(
-        '#tag' => 'button',
+        '#tag' => 'span',
         '#attributes' => $attributes,
         '#value' => '', // It's an empty span tag.
       ),