How can Mark Zuckerberg earned his money with his free Facebook services?

[Lunt]

The way most companies who offer their services for free do: advertising.

Quite simply, each Facebook user is associated with a profile which catalogs their interests, hobbies, liked pages and so forth. This information can then be used by Facebook to target specific advertisements your way.

Obviously, you don't have to click any of the ads, although it's undeniable that a lot do. However, the profit comes from the businesses and companies who pay Facebook to use their social networking medium as a means to promote a specific product or service.