Those who wish to invite friends to Google+, do it now and do it fast. It is now open for a short period only (according to the information).

This information was on Google+ and shared by many people.

I tried the invite. It is working, but the person that I invite did not get the email. So, I reckon that there is a delay. Do pester your friends who are already in Google+ for the invite.

Or here is a super easy method. Go to Google+ website and sign in your Google account.

http://plus.google.com

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