Buzz kill
I recently discovered VK.com (very much like Facebook) and found well over 150 of my images posted by users on that site many without attribution and likely copied from sites other than my own. One user even put their logo on my photos. I've sent a DMCA request to the site for what I could find, but there are likely even more and who knows if they will do a thing about it. I also recognized the work of many other miniaturists on there. Over the years, I've found my images all over the place (and reported them), but this is by far the worst.
NOTE: If you are a vk.com user, please do not post my images to that site.
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Edit 4/16/15 -- The main user who posted their logo on my work has removed the images volunarily so I've removed reference to that person. I am still pursuing other posts and making progress.
It should go without saying that no one should put their logo on my work, but many have done so and not just on any one website. Please do not put your logo or name on my work.