Really tedious method but it is worth it in the end.

Method:
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1) Register (http://gokano.com/ref/bWHl3pax) with valid email address, confirm it.
2) Download tor browser and create fake accounts to refer yourself. Each refer you get is 1 GN so you better be fast at typing! Or at least make a bot or something..
3) Cashout once you reach enough GN! There are a lot of rewards such as PS4, iPhone 6, Xbox controller, PS4 controller, Go pro, Macbook air etc.