Not only its users but the author himself, Google, was aware that Google Buzz still has many shortcomings that must be repaired to keep the experience of using this application by the user they are still good.
Google Buzz One of the weaknesses of that is regarded as an advantage for Google is that Google’s automated Buzz did when first application first appeared, for Google this is a breakthrough because we no longer need to bother to follow others who have become contact us at Gmail, but for some people this automated process that actually interfere with, because users are not given full control of setting up early for anyone who wants to follow and Following in anyone, including who can view our Buzz, your relationships, and anyone else who would appear in public profile. » Read more: Privacy settings from Google Buzz
As well as several developments that occurred after Google Buzz launched, 
A few days ago TweetMeme, launched a new feature that is Follow Button to anticipate trends using Twitter. TweetMeme itself is an application that provides Retweet Button feature that allows users to distribute content. Now there are also applications to anticipate trends similar to Google Buzz.
Ecosystem around Google Buzz continues to grow, continue to discuss some of the analysis of most new applications are consuming enough of Google this public. One interesting article was written TechCrunch which explains some of their views about the launch of Google Buzz launched too quickly before actually ready. 
