“FB.XFBML.parse()
This function parses and renders XFBML markup in a document on the fly. This could be used if you send XFBML from your server via ajax and want to render it client side. XFBML enables you to incorporate FBML into your websites and IFrame applications.”
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Force the FB library to re-render widgets that are on the page. This is useful when you are dynamically loading in the like or page widgets.