title: changing size of addthis social sharing buttons
body: <p>Using the 'AddThis' smart API for social sharing, does anyone know how to set the buttons to small size? Seems like it should be a simple setting but I've been unable to find it and am stuck with the 32 x 32. 
  <a href="http://support.addthis.com/customer/portal/articles/1200473-smart-layers-api#.Usw3JmRDs9E" rel="nofollow">http://support.addthis.com/customer/portal/articles/1200473-smart-layers-api#.Usw3JmRDs9E</a></p>
  
  <p>So far I have the following code and tried adding width and height but it didn't work:</p>
  
  <pre><code>addthis.layers({
      'theme' : 'transparent',
      'share' : {
      'position' : 'left',
      'services' : 'facebook, twitter, linkedin, email, print, more',
      //'width' :  "16px",
      //'height' :  "16px"
  } 
  </code></pre>