title: How to detect if API is down?
body: <p>As I type this the fb:like button is down - the Facebook API health page is reporting errors
  <a href="https://developers.facebook.com/live_status" rel="nofollow">https://developers.facebook.com/live_status</a></p>
  
  <p>I am sure it will be back soon, but how can I detect this?
  The reason being; I wish to hide other elements on the page as it looks odd when you have a facebook feature &amp; then the button is missing.</p>