Impressive, but are they active? Google now makes you sign up for gmail and activates a google plus account even if you create a new youtube account. I think its youtube which is pushing it given more and more footage is being uploaded every minute - you need accounts to do so! and there's a host of other google services people are interested in too, so the line is blury.

But well done to Google anyway, still impressive signing up more people no matter what product.