Client-side only user’s FaceBook email without typing

Facebook allows you to get a users email without the user of your web site having to type (assuming the user of you site has a FB account).
You will first have to create a FB app to get your own FB app id here:
http://developers.facebook.com/apps

Here is the full working example of no back end FB user’s email:
http://github.com/shawea/blueGrass/blob/master/latest/teachEx/FB.html

Notice the call:
fb.callFB(‘XXX’,onFbBack).

Here is a full video:
Let me know if you have problems reproducing this at support@primusAPI.com.
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