I have created an app, and now i want to post a message on one of my friends wall with use of the new Graph API. Is this do-able?

I am already using oAuth and the Graph-api to get a list of all my friends. The API at http://developers.facebook.com/docs/api tells me to cURL https://graph.facebook.com/[userid]/feed to read the feed, but it also tells me howto post a message:

curl -F 'access_token=[...]' -F 'message=Hello, Arjun. I like this new API.' https://graph.facebook.com/arjun/feed

Ofcourse this doesn't work! And I can't find out why..

Here are my PHP-code:

require_once 'facebook.php'; // PHP-SDK downloaded from http://github.com/facebook/php-sdk
$facebook = new Facebook(array(appId=>123, secret=>'secret'));
$result = $facebook->api(
        '/me/feed/',
        array('access_token' => $this->access_token, 'message' => 'Playing around with FB Graph..')
);

This code does not throws any error, and I know my access_token are correct (otherwise i could't run $facebook->api('/me?access_token='.$this->access_token); to get my userobject.

Have anyone out there sucsessfully posted a message using Graph-api? Then i need your help! :-)