It’s a neat feature, but TechCrunch misconstrues what is going on here. This change has nothing to do with Apple and Facebook’s business relationship. The actual story is that Facebook are using the standard
SKStoreProductViewController API available in iOS 6 provided for anyone to use in their app. Therefore, this feature was added by the Facebook development team independent of any special relationship with Apple.
TechCrunch just tries to shove business antics into every post they make.