gistfile1.py

        except (facebook.GraphAPIError, DrundWorkerError, urllib2.HTTPError), e:
            error = 'Unable to retrieve feed.'
            if isinstance(e, urllib2.HTTPError):
                try:
                    fb_error = json.loads(e.read())
                    error = fb_error['error']['message']

                    if fb_error['error']['type'] == 'OAuthException':
                        error += ' Please unauthorize Facebook via Settings > Manage Applications and then authenticate again.'
                except ValueError:
                    pass