Google Buzz: social media game-changer?

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Google announced this week it is throwing its hat into the social media ring. Google says the new Google Buzz tab will begin showing up on about 1 percent of Gmail user accounts starting right away. Google says the rest of Gmail users will be able to see a new Google Buzz tab in their accounts within a week.

Two things immediately caught my eye:

1. Google Buzz is integrated only into Gmail. Granted there are more than 150 million Gmail users, but there are still quite a few people who are not.