The way Google+ is growing is... neat. It's organic. Google is taking advantage of the huge advantage they have - a database of users and contacts via Gmail. No

The way Google+ is growing is... neat. It's organic. Google is taking advantage of the huge advantage they have - a database of users and contacts via Gmail. Now I have a Google+ account, and I am encouraged to use it normally. I place friends that Google suggests into my circles. Google knows who my friends and contacts are already, because I email them through Gmail. As soon as I share something with my 'Friends' circle, they are emailed about it, and subsequently given the opportunity to sign up. I don't have to send them an invite. Me interacting with them IS their invite. Google knows about them because of me, before they give their information over. I've effectively already signed them up, because I've added their email address to my circle. It's 1 part big brother, 1 part genius.