Facebook SDK script support
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"Like" button problem
It is a little unclear when exactly the problem occurs but mainly when some users with older browsers and especially with IE (Internet Explorer) come along and press the "Like" button.
I guess it also happens with the app_id and some OPG (open graph protocol) stuff going on in the background. The whole information is a little bit hidden in this document
The problem is mainly about scrapping the content for the current webpage. When a user clicks the "Like" button a comment box is offered and some content from the current page included. Accordingly, Facebook makes a request to the current page.
This request may result in a log entry on the server side with a parameter fb_xd_fragment added to the link. I think this is probably not a direct problem for the user, i.e. seen by the user but Facebook, depending on the web application, cannot find any content for the comment box. My framework actually returns a 410 error page.
There are two things to prevent this problem. For one thing it requires a channel.html file on the server which apparently prevents this call.