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I think the chances are that it's not, but I don't know that for sure. I don't think people will care about tactics as long as they have a critical mass of people on the social network to make it worth their while. Facebook was/is incredibly invasive with its crawling/spamming of contacts in order to gain traction.
The problem for google is that people's parents and grandparents are on Facebook. I mean, when they've penetrated that deep demographically, how are you going to yank them out into a new platform? Early adopters can only do so much. I think the most likely scenario for G+ (if it survives) is that it becomes a different social network alongside Facebook, LinkedIn, etc that serves a niche community.