Both the referrer and the new user get a free ride credit when someone signs up with their code and uses it for their first ride. Uber has found success using bappa rummythis approach to attract new users and compensate current users for referrals. Another great app for referrals is Airbnb, which lets users earn travel credits by suggesting friends to use the website to book lodging. Users can share their special referral link with their network by using the one that Airbnb provides.