Airdrop event ends on Sunday. Get your free IOS token from their website. To receive it just key in your ether address.
To get the airdrop: This is their twitter link :https://t.iost.io/?c=vZVvMbge You can double check by going on their twitter page. https://twitter.com/IOStoken
My referral link if you would like is https://t.iost.io/?c=NRfhAOkM I get 68 tokens if you do. Much appreciated.