“@psy_oppa Congratulations! You made history! 1 Billion Views!” tweeted MC Hammer on Dec 21 2012 as PSY’s “Gangnam Style” Youtube video topped 1 billion views. How did PSY’s Gangnam Style video, uploaded on July 15 2012, achieve such stunning marketing success over a short span of 5 months? In a Harvard Business Review blog, marketing […]