Facebook like button detect with javascript - javascript

I'm writing an app. for Facebook using HTML and Javascript. I'm trying to detect with javascript when the "Like" button on the Facebook page is clicked. I don't want to embed a "Like" button on my app page as Facebook already has a "Like" button at the top of the page right after my company's name.
I'm using Facebook's iFrame to display my app, but I haven't found any examples in Javascript to catch the "Like" click event.
Thanks for any help

Because it is in an Iframe the same origin policy applies. You cannot access content cross-domain. It is a security violation.

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Facebook support answered me here https://developers.facebook.com/bugs/1109206649216632/
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