It's definitely debatable. My take is different then yours, of course, or I would not have posted what I did. I would, however, like to see it settled so that there is no question in the future.
The incident with Jeanie is a good example. She sent that picture to Turn_Ova who posted it. She sent it in order to solicit business. However, I am sure she did not expect it to be published. As a result, she objected and became enraged when she saw it posted. Now if she had posted it in an ad, she would have had no grounds to object. But she considered it a private matter between two people, I assume based on her reaction.
Turn_Ova defended himself to me by offering up the example of Michelle from Island Park. He told me that he has seen her photo published in her thread and informed that it's a photo she sends to guys that is from her driver's license. And I understand that's why he followed suit. Since that photo is not something that is available except to law enforcement and the only way someone could get it is if she gives it to them, is that also allowed to be posted?
I see it as a matter of perception vs. reality. The reality is that they both released the pictures and shouldn't have any expectation of what happens afterward. In Jeanie's case, her perception, however, is that she did not intend for the picture to be shared. It would probably take a legal ruling to get to the bottom of it. First question might be one which you've mentioned on occasion. A model release for the photo. In this case, I'm sure there was none.
Beyond this, there is also the issue of photos from a provider's personal FB page when it's discovered. Those are publicly posted photos. It seems logical then, that those should be allowed to be published. And if you can do that, can you also publish the real name of the provider? That is public information, too. And to take it one step further, what about public arrest records? Members have alluded to them on occasion, but no one has ever actually posted them. Should we allow that, too?
No, I think this is a slippery slope. Better to err on the side of caution. Only allow photos which appear in ads. After all, the only photos I ever see in aggregator posts are photos which first appeared in an ad somewhere, be it BP or one of the provider websites. Of course, I am not the final say on this, so you will have to rule here, Slinky.