title: Google plus API: How to check if user is sharing URL page?
body: <p>Is it possible to find out, whether visitor of my website is sharing some particular URL on his Google plus stream?
  Could I get this information using PHP or Javascript?</p>
  
  <p>EDIT: 
  I mean sharing URL using share link 
  <a href="https://developers.google.com/+/web/share/#sharelink" rel="nofollow">https://developers.google.com/+/web/share/#sharelink</a>
   not sharing after clicking on +1 button.</p>