Facebook has nearly killed Orkut. Google Buzz died. I have been using Google+ for a few months now.
Facebook has connected innumerable long lost friends and classmates, although various social networking sites tried to achieve the same in the past and failed. Facebook succeeded; call it a hard work, vision or luck, it succeeded. People hate to use more than one service for the same purpose. If G+ is trying is pull people out of Facebook and join G+ in bulk, they are most likely to fail miserably. I am trying to guess that this is not the intention of the G+ team.
Twitter is all about catching the news around the world in one liners. Its also about time-pass chats (whats up twitter world? etc), gossiping (Shahrukh Khan slapgate etc), pulling legs of each other, and joking at life.
G+ platform is interesting. It is trying to connect REAL people who may or may not know each other, but share common interests.
G+ is full of circles. Building your circle and posting in that circle makes more sense than posting everything in public.For example, as a radiologist, I do not want to post something related to radiology in 'public', but post it in 'radiology circle' to have a more meaningful closed communication. All my Kannada related thoughts will be posted only to 'Kannadigaru' cirlce.
But we need a large number of active people who carefully select what to talk where? What to share where?
Will G+ succeed? So far, my experience is not that good. Very few people are active on G+.