Can there be such a thing as bad buzz? If so, Web giant Google (GOOG) may have just stepped into it, with the unveiling of a new social networking product unfortunately called Google Buzz. (Memo to Mountain View, Calif: Yahoo (YHOO) already has a product called Buzz, geniuses.) Initial reactions to Buzz were not positive -- and Google received a spirited mocking from rivals Yahoo and Microsoft (MSFT), which backs Facebook. In fact, Google's new social offering may be too little, too late to stem the explosive growth of Facebook and Twitter.