Facebook has just finished sharing its new messaging system with the world. And while the social networking site says that “it’s not e-mail” or designed to be what many pundits wanted to call an “e-mail killer,” it represents a big overhaul of a system that’s being used by more than 350 million people to send more than 4 billion messages daily.
http://mashable.com/2010/11/15/facebook-messages-video/#5445facebookcom-Email