What are facebook features that make it a money maker?

[winglord01]

I'd say seven things:

1. Its presentation (much simpler and cleaner than MySpace)
2. Games (its got a lot of addicting games like Farmville, so people stay on a lot longer)
3. Marketing (pages and groups have allowed it to become a marketing powerhouse for businesses)
4. Interaction (it encourages people to make more friends, though Friend Finder, Recommended friends, etc)
5. Chat (duh!)
6. Mobile support (people can reach Facebook from wherever they are)
7. Demographic (Facebook was originally targeted to young adults, who are more mature. MySpace was targeted toward fickle teens. Look at MySpace now.)