Buzz is rolling out to Gmail users over the next few days (much in the way that the new Facebook layout took the best part of a week to reach everybody), but from the video and blog announcements, it looks quite nicely designed. Of course, Google haven't had a huge amount of luck with social platforms yet (there was Orkut, which was somewhat of an odd fit for the rest of Google's line, and the OpenSocial/Friend Connect APIs, whose lunch Facebook Connect seems to have eaten), and it remains to be seen whether this time will be any different.
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