Incentivize Power Usage with Giveaways

Objective
Increase habitual usage and long-term engagement at every stage of the user journey

Idea
Rewarding users is a direct way to increase user engagement. This tactic is especially smart for freemium products that hinge on getting users to max out usage. By designing the reward to be deeper involvement with the product, such as extra storage space, rather than meaningless gift cards, you can encourage desired actions and hook users into the product more and more.

Link
http://www.appcues.com/blog/increase-user-engagement?utm_source=community&utm_medium=growthhackers&utm_campaign=increase-user-engagement