Google Buzz, the new attempt by Google to bootstrap its Gmail accounts into a Facebook-like social media effort, has already generated two law suits over privacy issues. The earliest class action was filed in San Francisco in front of the Federal Trade Commission. See also this story in the San Francisco Chronicle. See this link for the complaint in PDF. And here is a supplement to the original complaint.
A second class action law suit was filed in federal district court by a second year Harvard law student. Google has posted a blog statement in response at their gmail blog. Google has also responded by making changes to Google Buzz, which they detail in this statement.
See helpful posts from Download Squad blog:
How to turn off Buzz & delete your profile, and
Complete coverage of Buzz at DownloadSquad.com