Sources revealed to CBS News that the San Bernardino killers had been viewing Islamic State (ISIS/ISIL) propaganda online, making them the latest in a long line of terror suspects the FBI is trying to monitor. While direct recruitment from Islamic State officials from Iraq and Syria in the West is uncommon, ISIS recruiters have been known for years to have developed an extremely adept online propaganda system, using encrypted messaging apps as well as publicly viewable social media like Twitter and Facebook. Their attempts to attract Muslims to their cause have been significantly successful, law enforcement officials warn. In May,...