'Remove many activities
:param activity_ids: a list of activities or activity ids'

def remove_many(self, activity_ids, batch_interface=None, trim=True, *args, **kwargs):

    del_count = self.timeline_storage.remove_many(self.key, activity_ids, batch_interface=None, *args, **kwargs)
    if (trim and (random.random() <= self.trim_chance)):
        self.trim()
    self.on_update_feed(new=[], deleted=activity_ids)
    return del_count
