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It’s no shocker that the web is buzzing about Google Buzz (terrible pun intended), Google’s most aggressive push into social media yet.

The new social updating and aggregation feature integrates with your mobile and your Gmail, providing a service that seems like a hybrid of Foursquare, Twitter, Facebook, and Yelp.

People are already taking sides, including some of Google’s competitors. Yahoo struck first, putting out an email about their own previous (and similar) social media efforts before Google even finished its announcement. Microsoft didn’t take long to make its thoughts heard, either.

Here are some choice reactions from web experts and Google’s rivals:

Microsoft’s statement can be distilled into one very simple phrase: Nobody should care about Google Buzz.

Here’s the actual statement in its entirety:

“Busy people don’t want another social network, what they want is the convenience of aggregation. We’ve done that. Hotmail customers have benefitted from Microsoft working with Flickr, Facebook, Twitter and 75 other partners since 2008.”

In three sentences, Microsoft manages to rip Google for building yet another social network, claim the social innovation crown, and promote its social integrations with its popular Hotmail product.

In reality, Buzz is far more advanced than anything Google has ever put out. However, Microsoft does own a piece of something that directly compete with Google Buzz: Facebook.

Google Buzz has the most potential yet to give Facebook and Microsoft trouble in the social space.

The Internet giant did not explicitly react to Google Buzz, ...