How do we deal with American supporters of terrorist groups like ISIS? Europe may have some surprising lessons with its kinder, gentler approach to homegrown jihadists.

While Jordan has made public its participation in US-led air strikes against ISIL in Syria, it has launched a quieter war at home, as authorities crack down on social media users and religious leaders who allegedly promote "terrorist ideology".

Support is mounting for a Medal of Honor recipient who is threatening terrorists on Twitter after the FBI warned soldiers to lie low on social media.  Dakota Meyer, who served in the Marines for four years, is trying to make the point that he doesn't want to live in fear because of ISIS, he told ABC News today.

The Federal Bureau of Investigation and the Department of Homeland Security this weekend jointly issued the strongest warning yet for U.S. servicemen to scrub their accounts on Facebook, Twitter and other social media.

Mr. Bakhit, 36, is a Jordanian comic book author and entrepreneur who creates Middle Eastern stories that are an alternative to terrorist ideologies. His field research has included surveys of children in poor neighborhoods in and around the Jordanian capital of Amman and in Syrian refugee camps.

Young Australians travelling overseas to take up arms with the militant group Islamic State have naively bought into a fictional fantasy fuelled by social media, a human rights activist says.

Islamic State has been seizing foreign aid destined for the neediest Syrians to redistribute under its black flag—the latest tactic in the extremist group’s quest for power.

“[ISIS] is not only decapitating individuals, they’re trying to decapitate civilizations,” says Richard Stengel, the Under Secretary of State for Public Diplomacy and Public Affairs. “They are purposely destroying monuments and relics, and trying to destroy some of the important symbolism of Islamic unity going all the way back to the 7th and 8th century.”