Summary Box: Google addresses Buzz privacy worry

THE BUZZ: Google introduced a social hub called Buzz that automatically created circles of friends based on users' most frequent contacts on Gmail.

THE COMPLAINT: Those frequent contacts aren't necessarily your best friends. They could be business associates you might rather keep out of your circle.

THE RESPONSE: Google is giving users more control. Among other things, it'll be easier to block specific people from following your photos and other updates.