FB get original link

//By Drizer
(function(c) {
    if (c == undefined) return;
    var b = c.split('_');
    if (b[1] == undefined) return alert('Invalid.');
    location.href = "https://www.facebook.com/media/set/?set=p." + b[1];
}(prompt("Paste url", location.href)));
void 0;