Abu Abdul-Rahman nee Mark Taylor of New Zealand disclosed the locations of several ISIS safe houses. Whoops! He was proudly sending tweets about his brave activities in Syria. But he didn’t know that he had geo-location turned on and every tweet disclosed the location it was sent from! He deleted the tweets later, but too late. Interested citizens had already captured them and turned them over to intelligence agencies.
He is also a favorite because he publicly burned his New Zealand passport… then asked to have it reinstated.