To be a part of this breakthrough technology, you have to download the app and have a referral code to input during sign-up. You can't sign up without a referral code, as this is strictly invite-only.
Freebitcoin.io offers 50% referral commission for friends you bring who play the Free Bitcoin (BTC) game.
Invite your friends to join Dropbox, and for each one who installs Dropbox, you'll both get 500 MB of bonus space up to 16 GB.
All miners are allowed to join affiliate marketing program with 5 levels respectively: 8% - 3% - 2% - 1% and 1%. The corresponding commission will be immediately added to your account each time your referral purchases or upgrades plan.