Google Buzz won't threaten Facebook in the social networking arena because users are comfortable with the service and have created a lot of content there. Buzz will hit a ceiling and that ceiling is the number of Gmail users, the majority of which are probably also Facebook users. It's hard to see Facebook users fleeing the leading social network for the new, less fully featured experience of Buzz. Google's challenge with Buzz is similar to that of the stacked deck Microsoft Bing and Yahoo face every waking day in search.
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