function invite() {
	var request={
		method: "apprequests",
		message: "Download your Facebook photos and your friends' in a single zip or pdf file with Pick&Zip.",
		title: "Select some of your friends",
		data: ""};

	FB.ui(request, function (response) {
        if (response && response.request_ids) {
			trackPage('/invite/'+(response.request_ids.length));
        } else {
			trackPage('/invite/cancel');
        }
    });
	return true;
}