title: How to access Facebook user ID from javascript within a fb:iframe?
body: <p>I am writing a Facebook application that is a simple board game which I have implemented in javascript. Facebook only seems to let javascript applications run within an iframe so I am loading the page using <code>&lt;fb:iframe&gt;</code>. I just want to be able to tell the javascript the user's id so I can tell the user if it is his turn or not but I can not find documentation on accessing facebook data from within the fb:iframe. I am probably missing some basic conecpt as I do not understand the facebook API very well.</p>