docs: def friendship_followings(self, user_id=None, user_name=None,
                                page=1, count=20):
          """doc: http://open.youku.com/docs/doc?id=26
          """
          url = 'https://openapi.youku.com/v2/users/friendship/followings.json'
          data = {
              'client_id': self.client_id,
              'page': page,
              'count': count,
              'user_id': user_id,
              'user_name': user_name
          }
          data = remove_none_value(data)
          r = requests.post(url, data=data)
          check_error(r)
          return r.json()