What is Facebook using for income?

[Kirk]

I guess that their is advertising on it, but when I was active, I don't recall seeing any. This Mark Zuckerburg has a net worth of 6.1 billion dollars, but what from?

[Star]

There are plenty of ads now. Banner ads or three smaller ads on the right side, plus sponsored links, etc.

[Cecil Grant]

facebook mostly uses advertisements, but keep in mind most of the best games have a system for paying real money for some sort of advantage. Facebook collects a certain percent of income from games hosted on facebook.

[Smokies Hiker]

A lot of the value is the estimated worth if facebook were to be sold. People invest in facebook just like the stock market.