Hi Steve:
Yes, the poster of an image to an online site can put a watermark or logo on that image before posting it. Adding some sort of identifier to a graphic is accomplished with many different graphics programs. It's simply a matter of copying another small graphic and posting it on to the picture you want to show, then using a "group" feature in the graphics program to make it all one graphic.
Unfortunately, any identifier that you add can be removed easily with a number of programs (some of which are free) available online.
So, basically, whatever is posted to a public forum or shows up on a Google search can be copied, altered, and used for scamming. This happens frequently.
Sad but true.
Ian.
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