You can earn IOST by referring friends and completing quests.
If you logging into IOST Community Hub every day you can get contribution points.
For the first logging in you get +5 IOST, for every next 6 logging in you get respectively 10, 20, 25, 30, 50, and 100 Contribution points (CP). After logging in every day for 7 consecutive days, you will receive 100 CP for each consecutive daily login.
IOST is currently available on all top 5 exhanges: Upbit, Binance, Bitfiniex, Huobi, and Okex. You can also trade IOST on other 20+ major exchanges !
Registration link : https://hub.iost.io/register?inviteCode=r1e3haxDEm&lang=en
Details
Medium : IOST Community Hub Referral Program