How to enable google buzz in gmail?

I am still trying to grasp the idea behind Buzz. Is it limited to only those with a Google account or anyone?
 
It's only limited to Gmail users as far as I am aware, it's pretty boring though.): I thought it'd be so much better...
 
Buzz is still in beta version, I suppose. When you open your gmail, you can find it under the inbox link. It's actually nothing great, but it's a bit fun though.
 
I don't get it. I haven't enabled Buzz but somehow it still just appeared under the Inbox link in Gmail.
 
I don't get it the same way I don't get twitter, I just don't get the idea behind it (twitter) and the point of putting minute by minute updates on there.
 
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