Is there a way I can see if someone copies/saves my photos from my facebook?

[niq]

Recently, my friends have been telling me that a fake page was trying to add them, so I went to investigate. I found a fake page and they not only stole my photos but this person stole photos of other people's kids and claiming to be "a family". The weird thing for me is that there was more than one photo of me & the kids involved. Since then I've reported the page, but what would posses someone to do something like this? Why would someone take photos of children and claim them as theirs? And is there a way I can track who copies my photos?
That's the thing. My facebook profile IS private. So that means someone on my friends list possibly done it.