The lulz license. These examples of use may or may not give you confidence in using the rage faces commercially or non-commercially:
- There is a Rage Faces for SMS app in Apple's App Store. It made it through their stringent approval policies and has been there for months. It's a free app, but the owner has other apps for sale that can be accessed from the app's page in the App Store.
- The Cheezburger Network, which recently had $30 million invested in it, is using Rage Faces to make advertising money.