Thank you, folks. This is, at least, some start towards understanding the issue.
Justin, I've not been able to find any images associated with the posts.
Max, I was pretty sure they were humans (we used to have bot issues, but a plugin helps greatly with that). Poor 3rd world jobs ... so sorry about the human condition.
Is there any way we can know if someone is PM'ing spam?
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Is the information presented here:
http://bobschwarz.com/combatting-vbu...t-and-pm-spam/
still worth anything?