How many images are hosted by stack.imgur.com that aren't referenced by any questions of the SE network?
Two possible situations that may lead to abandoned images:
I write many questions containing images that never actually get asked (researching while writing to form a good question often leads me to figure out my issue). I'm sure I'm not the only one.
Questions containing images get removed from SE.
Do these two situations lead to unreferenced images, and if so, is there a way to find out how many such images there are?