I think the guy is using fuzzy math. That number doesn't seem realistic to me. I guess we'll see when Google releases real numbers. :-/
Interesting, but seems too soon for that amount of users. G+ button did however managed to find it's place on most blogs and sites in short period.
even if their are that many users how many are actually active? everyone signed up to see what it was like then decided no one was using it and went back to facebook.....
I just from curiosity that causes a new service from Google, but reallydid not create the addiction as facebook or twitter. But wait, is still very green this issue