WhatsApp has succeeded because it is focused on creating a great product, not another social network. What will make your business unique is what you deliberately choose not to do.

After almost two years of chit-chat, WhatsApp sold to Facebook for $19 billion yesterday. For a moment, let’s ignore whatever we think about the valuation, and whether in the larger economic picture this is something to be concerned about.

Here I won’t get into the whole strategic thinking behind why this deal makes or doesn’t make sense. What I will do is talk about the picture below:…