Why Do Things Go Viral? (PHOTOS, VIDEO)

Why do some videos go viral? Why do some products get more word of mouth? From the Harlem Shake to Gangnam Style, some videos become huge hits. And some products like Chobani or Facebook spread like wildfire. Why? Turns out it's not luck or chance. There's a science behind it. And it's not about cute cats.

My latest book Contagious: Why Things Catch On ($26, Simon & Schuster) shows how six key principles drive all sorts of products and ideas to catch on.

Why do things go viral?