Children and teens are trafficked for sex and exploited for pornography, and the web amplifies this trade. The National Center for Missing and Exploited Children received 500,000 potentially explicit images of minors online in 2004. By 2011 it surged to over 17 million. The tech world is starting to intersect with the advocacy and outreach world on how to deal this issue in situations where legislation has been unsuccessful. Zenon Evans highlights an organization called Thorn and the pros and cons of their strategies: surveying, surveilling, and spreading information.