The FBI is investigating at least 250 people who may be tied to online networks that target children.These networks encourage kids to hurt themselves, other minors or even animals. In some countries, they have been tied to mass casualty and terrorism plots.NPR's domestic extremism correspondent Odette Yousef has spoken with a family that experienced this firsthand. For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org. Email us at [email protected] more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy