Google+ invites open now. No tricks needed any more.
Just look for small image with a red envelop having G+ invitation letter inside it, on right panel of your main Google+ Page.
Oh it was difficult telling it. Look for the following image on the right panel of Google+ main page.
Click the link “Invite people to join Google+” and just add email addresses in the box provided.
Just like it before, the invitee won’t need to click a link sent to him or her. If the invitee signs in with the email address that was invited by someone, Google+ will let him join automatically.