Did you actually felt the need to have such a website? Or you just figured people will like it? How did you figure that out?
I think I understand it now. People use this, because they wanna hear people saying good things about them. I think most people would send link to their friends, because they don't feel very confident about themselves.
It's the basic principle of Facebook (or of whatever Facebook turned into) - people post things so they would get positive feedback and they would feel better about themselves.