The issue of monetizing in The Social Network. What is your opinion? Why is facebook so successful?

The issue of monetizing the social networks is maded for whole world, esspecely for the younger people.There is many social networks  in the world like Hi5,Twitter,Facebook. My opinion for Facebook is that someone should maded,and for me is good because many things,first you can chat with your friends,than you can make you own profile,and also share thing with your friends.But maybe,making a social network(facebook)is kind of a risk because there will be someone who will want toa corrapted that or to hack not only the whole page,but also you.But in other way for now is okey,and facebook is so successful because many people have accaounts and profiles,and not only for me,but for the whole people in the world that are using facebook,this is the best social network that ever made.Mark Zukerberg made facebook,but he made with his idea and he made that in notepad,and also programing there.I think facebook is good enough.