Getting Facebook User Id On The Fly

hi, I am looking for a way to get user_id of the logged facebook user soon as they visit my page.. e.g.

someone who is logged in to facebook.com already and visit my website http://abc.com and it should display their user_id like this : Your User Id : 11123232111

I dont want them to click on “Login” or through API or user FB.Connect.. what is the best possible way to get it without user interaction..

regards

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