I swore that I was not going to say anything further. I really, really tried, but I'm going to have to throw away the little plastic medal that says, "Two Weeks And No Buzz." Here's a must-read quote that a colleague forwarded to me:
So why exactly did Google Buzz launch with some key social features missing? Jackson said that while Google employees were testing out the product internally, they never had much desire to mute any of their coworkers, and that their email contact list closely matched the people they wanted to follow on Buzz. Obviously, that wasn’t true for most people once the product was released outside of the Googleplex. Which is why Google is considering pre-releasing new Buzz features to a few thousand opt-in users long before they’re rolled out to the public.
The short version: "It worked for us inside the firewall, so we never thought it'd have a problem outside the firewall." Of course, an enterprise collaboration tool is a wholly different kind of solution than a social networking tool, so the requirements for the former do not completely cover the latter.