It's been a few days. Today I showed it to a semi-techie female friend and she loved it. Couldn't wait to send her an invite.

But the thing about "normal" people is that they just don't get that excited about joining any new site in general. They usually join them through peer pressure and after they start hearing about it on TV, or in other such common places.

So yeah give it time to grow naturally, the same way Facebook or Twitter grew. Don't expect all your non-techie friends to be on Google+ a month after it launched. Some will join, others won't (for now).