public function comment(string $message) : ?Comment
    {
        $comment = $this->postJson(sprintf(self::ACTIVITY_ENDPOINT . 'v1/users/me/comment/%s', $this->storyId()), [
            'commentString' => $message
        ]);

        // Since I couldn't find an endpoint that gave me a comment's info using just it's comment id, let's just grab the newest comment.
        $newest = $this->comments(0, 1, 'ASC');

        if (count($newest) === 0) return null;
        
        return $newest[0];
    }