I get your drift, however, plenty or revenues to something that isn't real its a bit scary.. what do i mean by that? Investing ins a company that offer services is like investing in a pink sheet OTC security there is nothing backing it up. Anyone can offer a service these days, Facebook was one of them then face book then twitter then wahts next!?>! so anyways When the internet get redesign or even stops for a moment FB will die in the process. http://www.icann.org/en/news/announcements/announcement-20jun11-en.htm
Facebook has plenty of revenue streams. Paid ads mostly, but they've also acquired a number of other companies like InstaGram, for example.
They are also in the beta stages of rolling out a "featured" post option where a user would pay to have their post appear at the top of a users "wall" instead of getting buried quickly as time passes.
There is also talk of on-site ecommerce of some sort to sell products.
While this may hurt user experience ,it will create more income, which will increase the value of the company.