Fix my Faceboook App bug by WonFineDay

I have a Facebook app that posts something to a user's wall. It has 3 issues: 1. It can only post ONCE. After that user must retsart browser 2. It has a return URL to which a user is directed, it does not correctly fetch all the GET parameters 3... (Budget: $30-$250 USD, Jobs: AJAX, Facebook, Javascript, MySQL, PHP)
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