According to a paper from the Brookings Institution, there are about 46,000 Twitter accounts out there being used by ISIS supporters. And they’re pretty active, too. Those accounts had an average of a thousand followers each, which is way higher than your average non-ISIS-related Twitter user.

A military-led operation against ISIS would require significant civilian support.

Retired Lt. Cl. John Nagl reflects on his time in the "first two" Iraq wars.

Can America effectively damage the fund-raising efforts of a non-state actor?

In the larger scheme, a $6 billion investment against ISIS is war on the cheap

What does that money buy, and how do you know you're not equipping the wrong people?

The sudden notoriety of ISIS is not welcome by businesses named, well, Isis.

The Iraqi Sunni insurgents have seized hundreds of millions from Mosul's banks.