Actually I wasn't being clear--I have been eyeing the people who comment on my images and I'd say I know 90% of them--on the others where I'll see a new comment and a corresponding drop in rating, I just made a mental note to see if that happened again on the next image. So far I haven't seen any correspondence, and on the Conan image the members I didn't recognize were a different set than the ones that I didn't recognize commenting on my pieces...this would be easier with a Venn diagram..think two non-intersecting circles of unknowns, where an intersection would represent the person or persons leaving negative ratings and positive comments. But I am thinking there must be a way to leave a negative rating and no comment at all.
Re tubers..what pests. I hate those potatoes;-) I occasionally catch one using photobucket, but most are too smart to do that.