The Islamic State of Iraq and Syria (ISIS), an Al-Qaeda-inspired Sunni militant group, is mocking Michelle Obama and so-called hashtag diplomacy on social media. The jihadists’ Tweets are also bragging about the capture of Iraqi military vehicles. On June 10, less than a thousand of ISIS militants in soft-shelled pickup trucks occupied the northern Iraqi city of Mosul with a population of 1.8 million people. The city fell with no apparent resistance as scores of Iraqi troops fled dropping their uniforms and leaving precious US-made hardware behind. The militants celebrated getting US-made Humvees and tanks – some of which have...