Google Buzz helps you to share updates, photos, videos, and more. You can
start conversations about the things you find interesting.But in case you dont like this then you can disable google buzz at the very bottom of gmail. You don’t need to add any widget for it to appear.

If your orkut account is hacked then only you are responsible for this , Orkut always recommend users to surf safe while accesing orkut but instead of this many users account is hacked .