Using Google Chrome, go to Google.com and select Google images. Drag a JPG image from your HD into the search line on google images. (not just Google)

It will spin a little, then give a results set of "similar images". Your photo will be in the search line, but below will be a results set of "similar images". This is where I found someone had copied and posted my image.

Let me know if that does not work for you.