I have seen some strange text in some Facebook comments
Some random comment made by a user followed by some machine generated tag
[cid:image001.png@01CC0B1B.C4242F30]
While searching for such pattern in Google, I found that some Flickr photos are also titled in the same pattern.
I think this format is inserted when you reply the FB comments by e-mail and there is an image as signature, but I don't even know if it is possible.