You can earn money by:
-referring friends
-installing other apps (mostly games)
-liking brands on Facebook
The rewards include Starbucks, iTunes, Nintendo, and Playstation Network gift cards.
If you want to earn an extra $0.25 after signing up, enter the code JC871886 when prompted.
It is very easy to earn rewards with this app. Give it a chance, and let me know if you have any questions or have trouble locating it from the app store!