Bonus Buddies was meant to be for the USA. Basically, if you were from the USA and you got 4 clicks from new users you got a $20/20 coupon. And if you invited existing users it required like 7-8 clicks. And later they tripled the number of clicks required.
Today the campaign will be ending.
It worked from Europe too for like 2 weeks if you changed the shipping country to USA. I managed to get about 20 coupons. But later they changed it so you could only get it if you had a US ip and the coupon was used for an order to a US address…