For Facebook developers

Hi! I need an application that runs in every 5 minutes and check wether a shared post on my facebook page wall is older than a given time for example (an hour), and if it is, it hides that post from the page. So just for sure it is clear: I have several facebook pages, and i need a facebook application that hides automatically the shared posts after a given time. The given time must be adjustable, it is not probelm if i can change it only in the code. The application has to work on more facebook pages. Important! I use rss graffiti to share posts and by using that, it gives no option to "Delete..." a post, just to "hide from page" option. I don't know whether it is important or not i just wanted to let you know, that it allows only hide from page option.