We live in the "viral" era, in a connected world where audiences are global and hits are BIG hits. The world's most watched YouTube video has 2,800 million hits. The most popular tweet has been shared 3 million times. And it is not just the Internet. The most popular movie has sold more then 2,700 million tickets and the most popular book series has sold 500 million copies. What is the secret to these mega hits? Derek Thompson dedicated himself to figuring it out and in this interview he reveals the formula for popularity.