After being publicly sacked by al Qaeda leader Aymann al-Zawahiri and accidentally beheading a fighter from one of their main allies in Syria, it’s fair to say the Islamic State of Iraq and al-Sham (ISIS)’s PR campaign has suffered in recent weeks. So, like any half decent group of militant extremists, they obviously want to address this slip. Unfortunately, a traditional media outreach is very difficult for them, given ISIS’s policy of kidnapping journalists. So they've turned, like many before them, to social media. Over the past few weeks, foreign fighters from ISIS and their subgroup the Muhajireen Brigade have been...