Charlie Stross on the topic: http://www.antipope.org/charlie/blog-static/2014/02/rule-34-...

'For starters, it turns out that 3-11% of Yahoo! webcam traffic involves "undesirable nudity"'

"I am still trying to get my head around the implications that the British government's equivalent of the NSA probably holds the world's largest collection of pornographic videos, that the stash is probably contaminated with seriously illegal material, and their own personnel can in principle be charged and convicted of a strict liability offence if they try to do their job. "