you must be very naive if you are surprised by this revelation.it's always been the working assumption that all modern communication methods are being monitored.it's something that is simply too easy and tempting for those who have the power to do it.
An Interview of Edward Snowden who leaked the news to Guardian, also a heat map that shows Iran and Pakistan has been the hottest countries NSA has targeted.
[video=youtube;wB4Gn0u4DSE]https://www.youtube.com/watch?feature=player_detailpage&v=wB4Gn0u4DSE[/video]
