What Buzz offers is both a public and private group engagement, these examples used by Geoff, (yes, including my quote) depicts how some social media tools can be used depending on the needs of the organization or the type of social media campaign.

Haydon points out it can be used for those that may not be as tech savvy and the process won't seem to foreign to them.

Buzz has had it's rough spots as danah boyd pointed out at her SXSW keynote, people still want the control and options for privacy. Defaulting public is a bad idea. So having social media tools that can offer public or private choices is the direction that I believe will be successful models of future social networks.

My snippet is below but you should check out the whole article on Mashable.