require_once('facebook.php');
$facebook = new Facebook(
        array( 'appId'  => 'YOUR_APP_ID'
             , 'secret' => 'YOUR_APP_SECRET'));

... // authenticate user with access token here

$facebook->api('/me/feed', 'POST',
        array ( 'message' => 'YOUR_MESSAGE'
              , 'name' => 'YOUR_APP_NAME'
              , 'caption' => 'YOUR_CAPTION'
              , 'link' => 'YOUR_LINK'
              , 'picture' => '90x90_ICON_IMAGE'));