Is warfare headed online? South Koreans hacked into North Korea's official Twitter account recently and posted messages, defaming leader Kim Jong-il and son Kim Jong-un. North Koreans mounted an attack in retaliation and shut down the alleged website in the South responsible for the remarks. Justin McCurry writes further in, "Korean hackers mount cyber skirmishes in propaganda war," "...propaganda wars are not confined to private citizens: the Korean Times reported plans to launch propaganda audio and video webcasts targeting the few North Koreans with access to the internet." Pyongyang warns meanwhile of "grave consequences". You can learn more at the Council on Foreign Relations (CFR) website in "The Evolution of Cyber Warfare," a 2008 article by Greg Bruno.