title: How to post to friend's notification area?
body: <p>I have a web site facebook app. I can login and post to users wall.What I really want is when a user creates an image on my web site , he can create a notification on couple friends to take an action on the image. How can I do this ? 
  I have this code but I don't see a notification at my notification area ?</p>
  
  <pre><code> var f = new FacebookClient();
          dynamic result = f.Get("oauth/access_token", new
          {
              client_id = FACEBOOK_APP_ID,
              client_secret = FACEBOOK_SECRET,
              grant_type = "client_credentials"
          });
  
          var token = result.access_token as string;
  
          var reqClient = new FacebookClient(token);
          var args = new Dictionary&lt;string, object&gt;();
          args["message"] = "Invitation to action message";
          args["data"] = "Invitation to action data";
  
          var reqResult = reqClient.Post("/" + facebookId.ToString() + "/apprequests", args);
  </code></pre>