There are many user-generated content features we can design to motivate our users. We can encourage users to share ratings and comments, check in daily to gain or unlock coupon offers, invite friends to gain points and win badges to become the top influencers… These social rewards are virtual accomplishments that make people feel good and help to facilitate a stronger bonding between the user and the app — the more you contribute to the app, the more you’ll be rewarded and recognized by others.
https://uxdesign.cc/ux-of-word-of-mouth-user-generated-content-in-apps-6ee4ab25cc93/
