Liking is a secret action which allows you to show your interest for someone who has caught your eye! You’ll know if you’ve Liked each other only if it is mutual.
A Hello is similar to a Like except that when you send a Hello to someone, this person receives a notification. It is the best way to get your profile noticed! It is a paid feature.
A Crush is the result of a mutual Like or Hello (or a Like and a Hello) between two profiles: it means that they're both interested in each other and can start exchanging messages.
A happner is a user of the app happn.
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