Google contact manager doesn't include built-in groups for Google Chat friends or the people you follow in Google Buzz. But, you can create a group for the people you follow in Google Buzz using a simple trick:
- Go to Gmail's contact manager, search for http://www.google.com/profiles. Here's the URL for the search results.
- Now you have a list of all contacts that have a profile and hopefully have Buzz
- Select All by clicking in the first dropdown menu above the contact list
- Select a Group or create a group with the name "Buzz" or whatever you like
This works because Google automatically adds each Google Buzz user you follow to your contacts list and also includes address of the Google Profile. If you've manually removed Google Profile address or added Google Profile addresses to other contacts, the results won't accurately reflect your Google Buzz group. Obviously, the group won't update automatically when you follow/unfollow Google Buzz users.
[ Source, Alex]