Get Google+ Invitation, How to get Google+ Invitation, the drama has to start yet

Get Google+ Invitation, How to get Google+ Invitation, the drama has to start yet! As it is about months to start Google+ by Google but people has still questioning that how to get Google+ invitation from Google? Why people are asking that question even Google does not give invitation to you. As per Google official statement placed on Google+ Page at http://plus.google.com/ stating that we are in limited trail. So people can forget to get Google Plus invitation from Google but they can use alternative ways to join Google+.