function isFan(){
		$signed_request = $_REQUEST['signed_request'];
		list($encoded_sig, $payload) = explode('.', $signed_request, 2);
		$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
 
		if (empty($data["page"]["liked"])) {
			return false;
		} else {
			return true;
		}
	}