The Facebook Id of your profile/page/group is a unique string which is numeric (and nothing else). Fetching the Id of a profile or page is easy: Just copy the address, (for example: https://www.facebook.com/vietxf) and change 'www.facebook' to 'graph.facebook' (for example: https://graph.facebook.com/vietxf) and voila!, you'll see the id in the body of the response page For groups, go to: http://www.wallflux.com/facebook_id/ and paste the URL to your group and you'll get the Facebook Id.
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