title: How to set the Thumbnail Image for Share Buttons from a site's Home Page to the Page being Shared
body: <p>I know the title is not worded properly but I do not know how best to summarize my issue.</p>
  
  <p>I have a <code>ShareThis</code> button installed on my site and an <em>older</em> <code>Facebook</code> Share Button.</p>
  
  <p>When I share any page on my site, both the <code>ShareThis</code> and the <code>Facebook</code> share pop-ups show a thumbnail version of the site's Home Page. </p>
  
  <p>I want the thumbnail to show the current page being shared.</p>
  
  <p>How do you make that happen? Is it even possible to do?</p>