Why would you expect that? By many metrics, Facebook's current valuation cannot be justified by their advertising revenue potential, so why shouldn't we expect Facebook to look to other products for revenue. Amazon, Google, and Apple all have very diverse revenue streams outside of their original core products (online retail, AdSense, and Macs), and in many ways it is the reason that these companies are so successful. If anything I would assume that Facebook is looking long and hard at opportunities to generate revenue from other products.