Buzz, the new social network web application from Google, sits within the confines of Gmail and is open to anyone who uses the email service. I won’t dive into mass-analysis mode nor will I re-explain the service as my colleagues have done a fantastic job of this already. There are a few things to consider here. Firstly, Buzz only works if you are a Gmail subscriber. While this may well be a massive number of users, it could also draw in many more users as a result. It’s not necessarily designed to be a Twitter or Facebook replacement or substitute, rather something amalgamated from the two existing services to better serve the Google user.
More on Google Buzz here