title: Retrieve facebook contact's birthday and add to google calendar for WP7
body: <p><br>
  how to do in easy way in <code>php</code> or something equal (<code>c#</code>/<code>js</code>) ?</p>
  
  <p>I need to get all of my facebook contacts (but only contacts with birthday) to create a text file compatible with google calendar?<br>
  In my Windows Phone 7 i would to show birthday from google calendar.</p>
  
  <p>How to do it?<br>
  What library i need?</p>
  
  <p>thanks</p>