There are few ways to find your stock photos in use (google your username; TinEye, etc..), but I prefer new "Google search by image" with extension for Firefox. It's very easy and shows you where and how people used your images. But this feature also shows you some pirate sites, where your images available for free and sites, where images posted with stock agency watermarks.. What to do with them each decide on their own.
Anyway, I found ~300
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