.themes/classic/source/_includes/sharing.html
5d1d04c5
 <div class="sharing">
   {% if site.twitter_tweet_button %}
   <a href="http://twitter.com/share" class="twitter-share-button" data-url="{{ site.url }}{{ page.url }}" data-via="{{ site.twitter_user }}" data-counturl="{{ site.url }}{{ page.url }}" >Tweet</a>
   {% endif %}
   {% if site.google_plus_one %}
   <g:plusone size="{{ site.google_plus_one_size }}"></g:plusone>
   {% endif %}
 </div>