I have the following problem:
Once the user is logged in facebook if I run the following code:
FB.api('/me', function(user) { alert(user.name); }); It pops up an alert with "Udefined" written.
But if I change the code in the following way:
FB.api( /[MY_REAL_FACEBOOK_ID], function(user) { alert(user.name); }); It response in the correct manner.
How it is possible ? Why '/me' never works ?
I think you might be querying "/me" in context of the app rather than the user. The documentation is not as explicit as it could be, but I've had the same issue.
Are you able to use FB.getLoginStatus?
After I have FB.init set up, I make a call to FB.getLoginStatus similar to what is found below. There might be a better way on how to do this, but it works for me.
Hopefully this helps:
FB.getLoginStatus(function (response) { if (response.session) { // logged in and connected user, someone you know graphUrl = "https://graph.facebook.com/me?access_token=" + response.session.access_token + "&callback=displayUser" var script = document.createElement("script"); script.src = graphUrl; document.body.appendChild(script); } else { // no user session available, someone you dont know }}); function displayUser(user) { alert(user.name); } 
Use the below code to overcome the Undefined problem:
window.fbAsyncInit = function() { // init the FB JS SDK FB.init({ appId : your_app_id, status : true, xfbml : true }); // Additional initialization code such as adding Event Listeners goes here FB.getLoginStatus(function(response) { if (response.status === 'connected') { alert("connected"); connecter=true; FB.api('/me', function(user) { alert(user.name); alert(user.first_name); alert(user.last_name); alert(user.email); }); } }); 
response.status === 'connected' rather than testing whether response.session is defined as in the other answer? Is this way better?