Simple, it didn't!
Facebook's business model revolves round placing (and charging companies for) tailored advertising round facebook pages.
As of 2011 facebook is generating almost 2 billion dollars of revenue a year from advertising and there new facebook credits.
You can make money from advertising rental properties if the owner of the properties is willing to pay you.
Consumer advertising is the advertising you see on television. The goal is to get consumers to make purchases, so that the business can make money.
Advertising revenue.
advertising
Advertising
I believe they make money from paid advertising and any google ads that are clicked
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To make you want to buy things so you spend money and make the company that's advertising richer
How else would they make money?
There are several ways to earn money through Facebook (although I personally never tried myself):MAKE AN AD.Whenever I play Facebook, I always see those little ads on the side of every single page. On top of those ads there is a tiny button that says "Make an Ad" or something like that. I never pressed it before (since I don't require to make an ad) but if you have a company to advertise, you can always add one, but it may require money.MAKE A GAME.In the games I play there is always a way to use real money; to buy "Cash" (an example is "Facebook Credits"). If you make a game entertaining enough that the player will use real money to buy special items or do actions that "normal money" on the game can't, you will earn money!Those are all the ways I know. However, they are very challenging ways (since Facebook isn't an easy place to earn money) and I advise you to find another method.