No, it is free to use!
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.
Yes, Google Buzz has a stream-like view on both the iPhone and Droid phones. ya du get a app or use the safari
Google Buzz was a service introduced in 2010. It was a social networking and messaging system. The service was integrated into Gmail for use.
It depends on what you think is "many people", but generally, many people do use it.
Not all but some of the add-ons are free of cost. You can use them without paying anything.
It won't cost anything. It will never cost anything to use.
Free of cost
Google maps are free to use for finding driving directions and distances from one location to another. Google maps also provide street level views which can be very useful for reviewing neighborhoods when comparison shopping for purchasing a new home.
WikiTree does not cost anything to use.
Ahscrump!
It used to cost $5 to download the wii internet, but now it is free to download and free to use.