[WJW]

Not GP, but doesn't this just kinda follow from the definition of inflation? If you keep offering the same value but the currency it is priced in inflates by N%, you "should" be able to raise your prices by N% and not gain/lose any customers since the inflation adjusted price remains the same. This will obviously result in revenue growth of N%.

If you want revenue growth above inflation, you will need to either acquire more users, charge them more for the same product, or both. Building up the value of the product you're offering can help with both. Of course in the case of facebook these points get a bit muddled, since the users get the product for free anyway and they have such a giant customer base that finding new users is becoming an issue.