Google and Facebook don't work because they utilize the X-Frame-Options[1] response header to prevent their content from being served in iframes. [1]: https://

Google and Facebook don't work because they utilize the X-Frame-Options[1] response header to prevent their content from being served in iframes. [1]: https://developer.mozilla.org/en/The_X-FRAME-OPTIONS_response_header https://developer.mozilla.org/en/The_X-FRAME-OPTIONS_respons...