What is the best money making app that you use with a refferal program?

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If you have a great money making app that you use please share. Personally I like using Adme. The refferal program is great and I make $1 per refferal. The cashout is a minimum of $10 and you are paid on the 1st and 15th of every month via paypal. Please share what you use as a refferal program and explain.