I think this is missing the point. Facebook's attorneys don't care about the technical details. They already know that whatever is technically possible is ent

I think this is missing the point. Facebook's attorneys don't care about the technical details. They already know that whatever is technically possible is entirely subordinate to how they can threaten the owners of the technology. It hasn't been tested in court, and there's a truly excellent chance Facebook would lose - either in terms of the court or in terms of what's left of their privacy reputation - but that doesn't matter one little bit. They have attorneys and money, and that's all that matters in this instance. Really. The facile assumption that "it's possible to aggregate thus it's OK to aggregate" is exactly the way normal people think (by which I mean, tongue-in-cheek, us), but corporate attorneys see all this in terms of power relationships and contracts. As far as they're concerned, the poster took pictures through their front windows, and they're damn well going to threaten him with kneecapping until he gives them his negatives.