code: protected function getFacebookObject() {
  		// keep only one instance during a session
  		if (is_object($this->fb)) {
  			return $this->fb;
  		}
  		
  		$fb = new \Facebook\Facebook([
  			'app_id' => $this->options['api_key'],
  			'app_secret' => $this->options['secret_key'],
  			'default_graph_version' => 'v3.0',
  			]);
  		
  		$this->fb = $fb;
  		
  		return $fb;
  	}
docs: Returns Faceboo API object inited with API settings
  
  @return Facebook\Facebook