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Facebook Object ID from url of webpage
Facebook object of any webpage can be obtained by using the graph api from the url https://graph.facebook.com/?id=[url of the page]
You can get the facebook object of thread of comments on this page here https://graph.facebook.com/comments?id=http://anilmaharjan.com.np/blog/2012/05/facebook-object-id-from-url-of-webpage
You can use other arguments as your requirements.