Why online hate is hard to track

Following a shooting that left 49 dead, we checked in with the head of the Anti-Defamation League in Colorado, who said hate online is often tough to track, but they do collect weekly reports on extremism unearthed on the internet.
Published: 7:53 PM MDT March 15, 2019
Updated: 7:52 PM MDT March 15, 2019