Facebook Graph API – upload photo using JavaScript

Yes, this is possible, i find 2 solutions how to do that and they are very similar
to each other, u need just define url parameter to external image url

FIRST one using Javascript SDk:

var imgURL="http://farm4.staticflickr.com/3332/3451193407_b7f047f4b4_o.jpg";//change with your external photo url
FB.api('/album_id/photos', 'post', {
    message:'photo description',
    url:imgURL        
}, function(response){

    if (!response || response.error) {
        alert('Error occured');
    } else {
        alert('Post ID: ' + response.id);
    }

});

and SECOND one using jQuery Post request and FormData:

 var postMSG="Your message";
 var url="https://graph.facebook.com/albumID/photos?access_token="+accessToken+"&message="+postMSG;
 var imgURL="http://farm4.staticflickr.com/3332/3451193407_b7f047f4b4_o.jpg";//change with your external photo url
 var formData = new FormData();
 formData.append("url",imgURL);

  $.ajax({
                    url: url,
                    data: formData,
                    cache: false,
                    contentType: false,
                    processData: false,
                    type: 'POST',

                    success: function(data){
                        alert("POST SUCCESSFUL");
                    }
                });