Years ago when I used the Flash runtime to put my game online I was able to create a facebook share button that simply opened a URL and this URL was actually a code that would prepare a post for facebook for the player to then send.
Here's what the URL looked like: Please login to see this link.
Now it just returns an error message saying user not allowed to see app.
Am I doing something wrong or is this URL trick just no longer allowed in general by Facebook?