How to send multiple values using ajax to PHP

I'm trying to collect a Facebook user info and then sign them up. How do i include more than one value in ajax?

$.signuser = function () {
    FB.api('/me', function (response) {
        var str = "";
        alert(response.name);
        var fbfname = response.first_name;
        var fblname = response.last_name;
        var fblname = response.id;
        var fblink = response.link;
        var fbusername = response.username;
        var fblink = response.email;
        $.ajax({
            type: "POST",
            data: {
                data: fbfname,
                fblname
            },
            complete: function () {
                //$('#booksloadjif').css('display','none')
            },
            url: "fbpost.php"
        }).done(function (feedback) {
            $('#fg').html(feedback)
        });
    });
}