title: Facebook API - how to publish/share with big photo
body: <p>I'm have followed a very <a href="http://www.hyperarts.com/blog/tutorial-how-to-add-facebook-share-button-to-your-web-site-pages/" rel="noreferrer">clear tutorial</a> to publish (share) a story on fb timeline.
  You can see the code I am using on my <a href="http://www.paulgodard.com/" rel="noreferrer">website</a> behind the FB Share button.
  How can I force the photo to be bigger instead of a thumbnail? 
  What should I add to the js code (FB.ui)? An action? 
  But what should I write it? 
  I am very new to FB api, so please in plain english... Thank you!
  Paul</p>