title: Facebook / IE8 - Session is not being persisted
body: <p>I have a Facebook iFrame application (written in PHP) and when I run it in IE8, my session data is not persisted. </p>
  
  <p>I'm using Symfony 1.4 and have tried both Symfony's session wrapper and $_SESSION. </p>
  
  <p>I set up two test pages: the first one defines <code>$_SESSION['foo'] = 'bar'</code> and calls <code>print_r($_SESSION)</code>. The second page also calls <code>print_r($_SESSION)</code>. I see my session variables set on the first page, but not on the second. </p>
  
  <p>Everything works fine in Firefox and Chrome, and I've had two other people test this on different PCs running IE8 and they have the same problem.</p>
  
  <p>I tried removing any Facebook javascript from my page thinking that it might somehow be interfering, but that didn't solve anything.</p>
  
  <p>Any help would be greatly appreciated, thanks!</p>