To get the most out of the rifts, you can do the following:
Increase your avatar’s level. The higher your level, the more currency you will extract.
Use the rift with your friends in a rift party. The amount of currency you each extract depends on the friendship levels you share with the members of the party.
Every 24 hours, you receive four special rift tokens that will quadruple the currency you extract from a rift. You can see how many of these you have on the left hand side of your screen. They are used automatically when you start using a rift.
If you watch two in-game ads while extracting currency from a rift, you'll receive 15 minutes worth of currency immediately.
Watch another in-game ad to double the amount you just extracted.