British Spies Said to Intercept Yahoo Webcam Images - NYTimes.com

Apparently we'll need another Snowden batch before we know the percentage for "desirable nudity"

"The program posed unique challenges. According to one GCHQ document, between 3 and 11 percent of collected Yahoo webcam images contained sexually explicit content. “Unfortunately, there are issues with undesirable images within the data,” one GCHQ document reads. “It would appear that a surprising number of people use webcam conversations to show intimate parts of their body to the other person.”
An internal agency survey of 323 Yahoo usernames found that 7.1 percent of those images contained “undesirable nudity.”"

British Spies Said to Intercept Yahoo Webcam Images - NYTimes.com