private function load_facebook_info()
	{
		$this->init_facebook();
		$this->init_session();
		if (array_key_exists('session_key',$_SESSION)) {
			$this->fb_sig_session_key = $_SESSION['session_key'];
			$this->facebook->api_client->session_key = $this->fb_sig_session_key;
		}
		$info = $this->facebook->api_client->users_getInfo(array($this->facebook_uid), 'first_name,last_name,pic_square');
		if (empty($info))
			throw new Exception("Invalid Facebook ID: " . $this->facebook_uid);
		$this->first_name = $info[0]['first_name'];
		$this->last_name = $info[0]['last_name'];
		$this->image_url = $info[0]['pic_square'];
	}