title: Can I check if a page is inside a facebook tab somehow?
body: <p>I have a webpage that is sometimes accessed from a facebook pagetab(not a facebook app), and sometimes it's accessed from a webpage as normal. </p>
  
  <p>I know facebook sends a bunch of data to the app through the FB-object, that I already use for some other info, like scrolling. Is there any way to find out if the page is inside an facebook pagetab or not? It's an iframe, so I can't just check the url.</p>