Yes, I've seen some of these, though not by someone named James54. I've seen them posted by Buttsex2 and Buttsex3.
The pictures are totally revolting and you know what? I have kids who often look over my shoulder as I freep. I've never before been concerned about that, but these pictures just appear out of the blue.
IMO, it is harassment or possibly cyber-stalking, if such a thing exists.
What about the poor folks at work? Could cause real problems too. Sigh.