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You do not have to use Gmail in order to use Google Buzz. However, you do need to use some Google product and make your profile there public. The Google Buzz help page says: "You can read your Buzz from a number of Google products. You can access it through the left-hand links in your Gmail, from your Google Profile, or from a mobile device." Please see the related link for details.
It might be because of copyright violations. The image might be subject to copyright. You have to use your image only as the profile picture.
Google Buzz was created in 2010.
Google Buzz ended in 2011.
Yes, Google buzz is discontinued on November 24th, 2011.
Well, what happened is another company bought Google and they put down Google buzz and started Google+.
It is probably because they have created Google+. It is like Google Buzz but better and like Facebook but for Google.
Google Buzz is free. All you need to do is to create a Google account.
Yes, it is. Google Buzz is all about sharing the favourites within the group and recommending these for the public. Google Buzz Icon, if pressed, is followed by your gmail account. Google buzz icon can be integrated through downloading API from Google's Webmaster Tool. Yahoo has also buzz.
You can't anymore because Google discontinued Google Buzz in Oct 2011.