The GREX app shows you which spots are hot right now. More people at a spot means more fun. Each spot has its own chat. Get in touch with other GREXers that like the same spot. You can use the app to show other users that you like the spot where you hangout. By sharing this information you support this spot and you attract more people to come to this spot.
Some spots may play out promotional gifts for fans and users. Agree to such a spot and receive your gift. Go to the spot to redeem your gift.
If you have a secret spot that you want to share with other users just create your own spot and see how many others agree to your recommendation.