The Challenges in Combating ISIS and Tracking "Known Wolves"

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Both sides in the war on terror are using social media. The Islamic State produces highly sophisticated recruiting videos -- and law enforcement can monitor the people who watch them. But that doesn't make preventing terrorist actions an easy job. We hear about technology, manpower and civil rights.

Also, who wants to read Hillary Clinton's emails? On today's Talking Point, Ringling Brothers Barnum and Bailey Circus will phase out its elephants—along with 100 years of tradition. It's all about public concern over how the majestic animals are mistreated.

Photo: Islamic State supporters' Twitter post threatening the social network's co-founder Jack Dorsey