When designers intentionally trick users into inviting friends or blasting a message to their social networks, they may see some initial growth, but it comes at the expense of users' goodwill and trust. When people discover they've been duped, they vent their frustration and stop using the product.

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

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

Habit-forming products alleviate users' pain by relieving a pronounced itch.

Why not live now instead of someday?

For an infrequent action to become a habit, the user must perceive a high degree of utility, either from gaining pleasure or avoiding pain.

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