" You are looking for a Habit Path—a series of similar actions shared by your most loyal users. For example, in its early days, Twitter discovered that once new users followed thirty other members, they hit a tipping point that dramatically increased the odds they would keep using the site.1 Every product has a different set of actions that devoted users take; the goal of finding the Habit Path is to determine which of these steps is critical for creating devoted users so that you can modify the experience to encourage this behavior. "

― Nir Eyal , Hooked: How to Build Habit-Forming Products