FB Auth JS

fbreg.js

function AuthorizeFacebook() {

    var paramsLocation = window.location.toString().indexOf('?');
    var params = "";
    if (paramsLocation >= 0)
        params = window.location.toString().slice(paramsLocation);

    top.location = 'https://graph.facebook.com/oauth/authorize?client_id=APP_ID&scope=email,user_education_history,friends_education_history,friends_work_history,user_work_history,user_location&redirect_uri=APP_URL';

}

function getUserInfo() {
    FB.getLoginStatus(function (response) {

        if (response.status == 'connected') {
            FB.api('/me', function (user) {
                // faz o que voce quiser
        } else {
            AuthorizeFacebook();
        }
    }, { scope: 'email,user_education_history,friends_education_history,friends_work_history,user_work_history,user_location'});
}