Blocks messages from a specifed user

        :param user_id: The ID of the user that you want to block
        :return: Whether the request was successful
        :raises: FBchatException if request failed

def blockUser(self, user_id):
        """
        Blocks messages from a specifed user

        :param user_id: The ID of the user that you want to block
        :return: Whether the request was successful
        :raises: FBchatException if request failed
        """
        data = {"fbid": user_id}
        r = self._post(self.req_url.BLOCK_USER, data)
        return r.ok