Google 10m users + 1 billion shared items. So What?

I think had we touted these numbers even 5 years ago, it would have been truly amazing. But with the explosive growth in being online worldwide, users have shown a greater proclivity for trying new services. It’s easy. Just sign up and go. Take it for a spin. Stop using it when you don’t want to anymore. There’s no “cost of trying.”

But with Google’s massive world-wide reach, I wonder what this 10m really represents of their current user base? 10%? 5%? 1%? In that case, it’s really nothing tha...