You forgot to mention...
This is quite possibly the largest database of "human" information in the world. Something that a lot of companies and "sellers of goods" want their hands on and in. Where else can you find out that a 35 year old white male from Nebraska likes this or that? Trends, tendencies, likes, dislikes, are all marketing dreams and companies pay big bucks to know this kind of information about all of the demographics. As long as people use facebook, facebook is relevant. And as long as facebook can sell your info to other companies, they will be a profitable company.
Facebook knows exactly what you like, what you don't like, when you are awake, when you are sleeping, how often you are online, how many friends you have, where you are going and where you have been. This information is like gold.
