Posts minimal activity with verb and bare self object.
        :param verb: verb to be used.

def _verb(self, verb):
        """ Posts minimal activity with verb and bare self object.
        :param verb: verb to be used.
        """

        activity = {
            "verb": verb,
            "object": {
                "id": self.id,
                "objectType": self.object_type,
            }
        }

        self._post_activity(activity)