In the source of this page, I can find three inclusions of this file. Once is on a div called 'shariff' on a 'data-media-url' attribute. The others are metadata tags; one is a link rel="apple-touch-icon"; the other is one of two meta property="og:image" tags (the other og:image metadata is your avatar image at a guess). I've no idea which of these three facebook is using.
Ah, thanks. Will fix that!
[doublepost=1462152822,1461534636][/doublepost]Did fix it, but couldn't get Facebook to updates its cache.
Please try to see whether it worked.