I remember an app supposedly found in Pizza biz selling child torture/ murder (finish your Pizza who are in poor health) and fresh pizzas in USA. All Silicon Valley gave $$$ to HC.

Another article on the same story:

Islamic State tightens grip on 3,000 Yazidi female captives, taps apps to sell them as slaves

http://www.japantimes.co.jp/news/2016/07/06/world/social-issues-world/islamic-state-tightens-grip-3000-yazidi-female-captives-taps-apps-sell-slaves/