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An iframe displays a webpage, which is always html. CMS scripts like Wordpress and Joomla and the php scripting language itself all create html code and deliver that html to the browser.
So what the other site opens up inside the iframe is always html.
So, to answer your question, any web page made from WordPress, Joomla etc should open fine in an iframe.
I'm not familiar with how faceBook handles iframes itself and defer to you on that. It sounds like you know they do.
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