This is working as designed. The author of the article didn't fully investigate why he was getting users with the fragment and if he alters his code, will negatively affect page performance on his page.

In order to do cross domain communication, Facebook iframes the current page with the fragment. When Facebook's javascript library in the iframe detects the parameter, it blanks the page to reduce the render time that it takes for the iframe to complete so that it can generate the cross domain communication channel faster.

Originally, Facebook had developers upload a file to act as the cross domain script but became a problem for some people who couldn't do this so for the most part. This is still doable, but most people don't read the documentation clearly and Facebook doesn't want to complicate it's message of a simple install( http://developers.facebook.com/docs/reference/javascript/FB.... ).