Is this the same thing as Buzz? If I want to 'connect' with friends, I have Facebook, and if I want to im work colleagues, I have Yahoo and MSN. For document

Is this the same thing as Buzz? If I want to 'connect' with friends, I have Facebook, and if I want to im work colleagues, I have Yahoo and MSN. For document collaboration I have email for non-realtime, Google Docs for near and actual real-time. I have a hard time seeing where my workflow needs any more collaboration tools.