Hooked

Hooked: How to Build Habit-Forming Products. by Nir Eyal with Ryan Hoover. a must read book for everyone who cares about driving customer engagement.

this book gives readers:

Practical insights to create user habits that stick.
Actionable steps for building products people love.
Behavioral techniques used by Twitter, Instagram, Pinterest, and other habit-forming products.
New for second edition! An additional case study for building health habits.