Well, privacy is the foremost reason. Just look at the Facebook crowd. You don't need me to remind you what morons they are. They practically advertise every little info about themselves to the world (eg. where they live, where they graduated, and even what they had for lunch. Really?? ). Why would you want to do that? Easy targets for the identity thieves. BTW traders are supposed to be alert at all times. Unfortunately, I see too many gullible folks on this forum. Just saying.
Well we are living in a global village now. In a village, everybody knows everybody and we can all trust each other.