title: posting on a friend's wall using graph API
body: <p>Posting a message on friend's wall, graph API. 
  i have the publish_stream extended permission of the user, who is using the application.</p>
  
  <p>the code workds if i want to post sth on my wall. </p>
  
  <p>is there any method to post on wall or send message to all the friends of a particular user??</p>
  
  <p>please help thanks!!</p>
  
  <p>following is the code, but it is not working.</p>
  
  <pre><code> $friends = $facebook-&gt;api('/me/friends');
      foreach($friends['data'] as $friend){
              $friendsUserId = $friend['id'];
              echo $friendsUserId . "&lt;/br&gt;";
              $result = $facebook-&gt;api('/$friendsUserId/feed', 'POST', array(                
                      message' =&gt; 'Test Message'                ));
              print_r($result);
          }
  </code></pre>