This is not news or a secret: http://blogs.microsoft.com/blog/2011/05/19/500-million-friends-against-child-exploitation/ http://blogs.microsoft.com/blog/2011/05

This is not news or a secret: http://blogs.microsoft.com/blog/2011/05/19/500-million-friends-against-child-exploitation/ http://blogs.microsoft.com/blog/2011/05/19/500-million-frien... You can learn more about the tech here: http://en.wikipedia.org/wiki/PhotoDNA http://en.wikipedia.org/wiki/PhotoDNA