Sounds like a silly question, but...
I'm adding the Facebook Javascript SDK to a site that appears to be in HTML5, it has a
<!doctype html>
and a <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
so I'm assuming this was the original authors intent.
However, looking at the Google Analytics for the site, there might be quite a few people using IE8 to visit the site.
We don't want to use iFrames because the XFBML and HTML5 versions are more versatile.
So this is why I am asking if should I use HTML5 or XFBML for the page?