What do Facebook, LinkedIn, Youtube, Dropbox and Skype have in common? Except for being ridiculously successful, they all enjoyed a strong viral effect that helped accelerate their growth.
How did they do that? Here’s the thing; most people assume that these companies grew by pure word of mouth. Well, that’s only half of the story. The other half is that they deliberately built viral features into their products that helped spread the word.
Let me explain.