Why two Google Shared Stuff pages?

I’m a regular user of the Shared Stuff feature in Google Reader. That’s the little widget in the sidebar, which feeds to a larger page. I love it.

I recently discovered another Google tool that also seems to be called Google Shared Stuff. This one works from a little icon in your menu bar. As you surf around the web you can add links and notes to a “shared stuff” page. But not the same shared page. It has to be a DIFFERENT shared page.

Why can’t the shared pages be shared? One page for stuff from my Google Reader and the “shared” button. If any of you kids in the Accelerated Class can help me out with this, I’ll be grateful.