I don't know if this XFBML code is affected by this bug, this code is relatively old and been out for a while... The code they are talking about is when linked directly to facebook's servers to download the latest javascript code...
As a test I put this into google:
inurl:fb_xd_fragment site:mydomain.com
And it didn't return any URL's so so far my site has been unaffected. However if you use a site name that has been affected hundreds of blank pages come up, such as:
inurl:fb_xd_fragment site:thefootballnetwork.net
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