I guess this should have been the first blog, but now the information has been digested here it is…
Google's belief is that organising the social information on the web — finding relevance in the noise — has become a large-scale challenge, one that Google's experience in organising information can help solve.
Google Buzz is a new way to start conversations about the things you find interesting. It's built right into Gmail, so you don't have to establish an entirely new set social networks from scratch — it just works.
Buzz brings this network to the surface by automatically setting you up to follow the people you email and chat with the most. Google focused on building an easy-to-use sharing experience that richly integrates photos, videos and links, and makes it easy to share publicly or privately. Plus, Buzz integrates tightly with your existing Gmail inbox, so you're sure to see the information that matters most as it happens in real time.
On your phone, Google Buzz is much more than just a small screen version of the desktop experience. Mobile devices add an important component to sharing: geolocation. Posts tagged with geographical information have an extra dimension of context — the answer to the question "where were you when you shared this?" can communicate so much.
Google have relied on other services' openness in order to build Buzz (you can connect Flickr and Twitter from Buzz in Gmail), and Buzz itself is not designed to be a closed system. Google’s goal is to make Buzz a fully open and distributed platform for conversations.