title: Detect if Facebook user likes a page without app authorization
body: <p>I'm building an iframe Facebook application and I want to set up a 'like gate' where a user has to like my page to continue past the opening of the application. (After they click like I allow them to click a 'continue' button using JavaScript).</p>
  
  <p>Is there any way to detect if a visiting Facebook user has liked a page without first forcing them to authorize my application? I know I can query their likes using the graph api or fql but I'd like to avoid forcing them through the auth dialog for this one part of the app. The reason I ask is that I've seen some applications on Facebook that appear to allow this functionality.</p>
  
  <p>For example, this page:
  <a href="http://www.facebook.com/velcrobrand?sk=app_156218351098324" rel="nofollow">http://www.facebook.com/velcrobrand?sk=app_156218351098324</a></p>
  
  <p>I don't have to authorize the facebook application but the page knows if I have liked it or not.</p>