Why are you on Facebook?

When Laurence Olivier was asked by Dustin Hoffman, why they did what they did as a profession, which was acting, Laurence Olivier came as close as 5 centimeters away from Dustin Hoffman, looked into his eyes and said: “Look at me, look at me, look at me, look at me…” Thus is, I maintain, the biggest reason for anybody to join a social network – vanity.