.themes/classic/source/_includes/post/sharing.html
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 <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 %}
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   <div class="g-plusone" data-size="{{ site.google_plus_one_size }}"></div>
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   {% endif %}
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   {% if site.facebook_like %}
     <div class="fb-like" data-send="true" data-width="450" data-show-faces="false"></div>
   {% endif %}
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 </div>