title: Facebook- Publishing a story to user's wall
body: <p>I am using facebook-php-sdk and my requirement is to post a story to the user's wall. My app requests the user for 'publish_stream' permission at the time of signup/login. After user has allowed the permission and logged in, somehow I am not able to publish to facebook wall a new comment created by the user on my app. This is the error I get:</p>
  
  <pre><code>Invalid OAuth access token signature
  </code></pre>
  
  <p>This is what I do:</p>
  
  <pre><code> $facebook = new Facebook(array(
                                 'appId'  =&gt; "$fb_app_id",
                                 'secret' =&gt; "$fb_secret",
                                 'cookie' =&gt; true
                           ));
   try {
              $fb_user_id = $facebook-&gt;getUser();
              $access_token = $facebook-&gt;getAccessToken();
              $facebook-&gt;api("/me/feed", 'post', array(
                                         'access_token' =&gt; $access_token,
                                         'message' =&gt; 'I love SO',
                                         'link'    =&gt; 'http://mydomain.com',
                                         'picture' =&gt; 'http://thinkdiff.net/ithinkdiff.png',
                                         'name'    =&gt; 'iOS Apps &amp; Games',
                                         'description'=&gt; 'Checkout iOS apps and games from iThinkdiff.net. I found some of them are just awesome!'
                                      )
                              );
              } catch (FacebookApiException $e) {
                   echo '&lt;pre&gt;'.htmlspecialchars(print_r($e, true)).'&lt;/pre&gt;';
              }
  </code></pre>
  
  <p>Do share your thoughts please</p>