Skype interviews

This method of journalism in covering Syria should be interrogated:  "a fighter calling himself Abu Yazid said in an interview via Skype last week".  Is it not relevant to ask how you stumbled on Mr. Abu Yazid (oh, or Mr. Yazid as you probably would write or as your editor would write)?  Did you just stumble on him as you were navigating the internet, or was the name and address provided to you by the propagandists of the SNC in Lebanon working closely with the Hariri press office? Should we not know?