Habit-forming products often start as nice-to-haves, but once the habit is formed, they become must-haves.

Users who continually find value in a product are more likely to tell their friends about it.

Products with higher user engagement have the potential to grow faster than their rivals.

To initiate (user) action, doing must be easier than thinking.

You'll often find that people's declared preferences - what they say they want - are far different from their revealed preferences - what they actually do.

Brainstorm new interfaces that could introduce opportunities or threats to your business.

Instead of relying on expensive marketing, habit-forming companies link their services to the users' daily routines and emotions.