title: How to get uid from user on Facebook Page?
body: <p>I have a question ! </p>
  
  <p>I wanna do customize message on my tabs on my Facebook page.
  Ex : Hello <code>Steffi</code> or Hello <code>Kevin</code></p>
  
  <p>How can I do that please ?</p>
  
  <p><code>fb:user</code> ? </p>
  
  <p>thanks !</p>