Facebook the No.1

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Facebook has now Globally become the No.1 Social Networking Site with the highest number of Registered users. It has managed to attract billions of people worldwide, both Young and Old. What does FB has in it that it has become the No 1? Has FB helped you in One way or the other? Has the Privacy Settings in FB set enough for you? What are the Advantages and Dis-advantages that FB has? Does anyone knows how to earn from FB? If so, How? Do you on a regular basis communicate with all your FB friends? What new features that FB needs to have or need not have? For me , I simply like FB just because everybody else likes it?