The web is atwitter with coverage of Google’s foray into social media with Google Buzz. Gmail users have probably noticed the Google logo-hued talk bubble that muscled its way onto their inboxes in February. For some, Buzz was a welcome addition to the Gmail party. Others wished they’d had the option to turn it away at the door. It’s one thing to have an unwanted guest turn up and wrangle his way in. It’s another to have someone else controlling the guest list and then making it available for all to see.