As an attorney I can tell you that child pornography (now known as "child abuse imagery, a term with which I disagree) is turning up absolutely everywhere. Some crim defense lawyers call it the new crack. Want to see a very interesting perspective, one that we almost never here? Here is an interview with some victims. It's not what you might expect.
I used to teach a course for cops that covered the definition of child porn. I've had to amend that definition in recent years. In short: teenagers are now taking pole dancing lessons. They are going to national competitions, putting their vids on youtube, and getting screaming mad at any suggestion that they be taken down. Standards change.
Further, this was already discussed here: https://news.ycombinator.com/item?id=15425906