The Open Graph object callback is truncated. Is there a character limitation?

I am posting actions to a user's timeline by submitting to as described in a tutorial in the Facebook documentation.

        function(response) {
           if (!response || response.error) {
              alert('Error occured');
           } else {
              alert('Cook was successful! Action ID: ' +;


However, when Facebook calls my object url, I am not getting all the GET parameters I went through and it looks like Facebook is truncating the url. Is there a limit on the size of the object url? The url works fine when I put it in the object debugger.


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